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Question 201Question →

Consider the following excerpt from a passage about the history of computing:

"In the mid-twentieth century, early computers were massive machines that filled entire rooms, modern microprocessors allow us to carry equivalent computing power in our pockets."

Which of the following is the most grammatically correct replacement for the underlined portion?

Show answer & explanation

Answer: rooms, but modern microprocessors

Answer

rooms, but modern microprocessors
The correct answer is the option that inserts the coordinating conjunction 'but' after the comma. This correctly connects the two independent clauses while showing the contrast between them.

Step-by-Step Solution

1
Analyze the two clauses in the sentence to determine if they are independent or dependent.
The first clause ('early computers were massive machines that filled entire rooms') and the second clause ('modern microprocessors allow us to carry equivalent computing power in our pockets') are both independent clauses because they can each stand alone as a complete sentence.
Identifying the clause type is necessary to apply correct punctuation and conjunction rules.
2
Select the appropriate punctuation and conjunction to link these clauses grammatically.
To join two independent clauses, a coordinating conjunction (such as 'but') preceded by a comma is required. Subordinating conjunctions or relative pronouns would turn the second clause into a fragment.
A coordinating conjunction like 'but' properly connects two complete thoughts while highlighting the contrast between past and present technology.

Key Concept

Two independent clauses must be joined using a semicolon or a comma followed by a coordinating conjunction (FANBOYS: for, and, nor, but, or, yet, so). Using a comma alone results in a comma splice, while introducing a subordinating conjunction after a semicolon results in a fragment.
Estimated Time:45s
Question 202Question →

The acoustic resonance of the newly renovated concert hall in Vienna is far more pronounced than most modern auditoriums, which often rely on electronic amplification to project sound clearly.

Which of the following choices best completes the sentence to ensure the comparison is logical and grammatically correct?

Show answer & explanation

Answer: that of most modern auditoriums, which

Answer

The choice that reads 'that of most modern auditoriums, which' is correct because the singular pronoun 'that' correctly and logically refers back to the singular noun 'acoustic resonance' of the concert hall.
The correct choice is the one that states 'that of most modern auditoriums, which'. This option correctly uses the singular pronoun 'that' to refer to 'acoustic resonance', which resolves the illogical comparison by comparing the resonance of the Vienna hall to the resonance of modern auditoriums.

Step-by-Step Solution

1
Identify the noun being compared and determine if it is singular or plural.
The noun is 'acoustic resonance', which is singular.
To make a logical comparison, the pronoun replacing it or the structure referring to it must match in grammatical number.
2
Identify the entity to which it is compared.
The original sentence compares 'acoustic resonance' to 'most modern auditoriums' (physical buildings).
A property of a building cannot be logically compared to the building itself.
3
Select the replacement that introduces a matching singular pronoun to represent the compared property.
The pronoun 'that' is singular and refers to 'acoustic resonance', whereas 'those' is plural.
The correct choice must use 'that of' and avoid punctuation errors like a semicolon splice.

Key Concept

Illogical comparisons occur when a sentence compares two items that are not of the same type. In ACT English, this error is corrected by inserting singular ('that of') or plural ('those of') pronouns to make the comparison parallel and logical.
Question 203Question →

The following passage contains an underlined portion.

Archivists working to preserve early wax cylinder audio recordings face unique chemical challenges. Because the organic compounds in the wax degrade when exposed to fluctuating humidity; they must store the cylinders in climate-controlled vaults.

Which of the following choices best corrects the underlined portion to make the sentence grammatically correct?

Show answer & explanation

Answer: Because the organic compounds in the wax degrade when exposed to fluctuating humidity, they must store

Answer

Because the organic compounds in the wax degrade when exposed to fluctuating humidity, they must store
The correct answer properly repairs the sentence structure by replacing the semicolon with a comma. Since the sentence begins with the subordinating conjunction 'Because', the first clause is dependent and must be joined to the main independent clause using a comma.

Step-by-Step Solution

1
Identify the grammatical components of the sentence.
The clause starting with 'Because' is a dependent clause that cannot stand alone as a complete sentence, while the clause starting with 'they must store' is an independent clause.
Understanding the structure of the clauses helps determine the appropriate punctuation needed to connect them.
2
Evaluate the punctuation separating the two clauses.
The original text uses a semicolon. Semicolons are used to separate two independent clauses, not a dependent clause and an independent clause.
Using a semicolon after a dependent clause creates a fragment, which is grammatically incorrect.
3
Select the punctuation that correctly connects an introductory dependent clause to an independent clause.
A comma is the correct punctuation mark to place after an introductory dependent clause before the main clause begins.
This establishes a clear relationship between the cause and effect while maintaining sentence completeness and avoiding fragments or comma splices.

Key Concept

Identifying and correcting sentence fragments caused by improper punctuation or dangling dependent clauses.
Estimated Time:1m 0s
Question 204Question →

Read the sentence below and analyze the underlined portion:

Because the red panda shares several anatomical features with both raccoons and bears. Scientists struggled for decades to classify it.

Which of the following choices is the best revision of the underlined portion?

Show answer & explanation

Answer: Because the red panda shares several anatomical features with both raccoons and bears, scientists

Answer

The option that connects the introductory dependent clause to the main clause using a comma: 'Because the red panda shares several anatomical features with both raccoons and bears, scientists'
The correct option connects the dependent introductory clause to the independent main clause using a comma. The word 'Because' introduces a dependent clause, which cannot stand alone as a complete sentence. By placing a comma after 'bears' and changing the capitalized 'Scientists' to lowercase, the fragment is resolved.

Step-by-Step Solution

1
Identify the grammatical nature of the opening clause beginning with 'Because'.
The clause 'Because the red panda shares several anatomical features with both raccoons and bears' is a dependent clause because it starts with a subordinating conjunction.
A dependent clause contains a subject and a verb but does not express a complete thought, meaning it cannot stand alone as a sentence.
2
Determine how to connect this dependent clause to the main clause 'scientists struggled for decades to classify it'.
An introductory dependent clause must be followed by a comma before the main clause begins.
Using a period or a semicolon creates a fragment, whereas removing the subordinating conjunction entirely while keeping only a comma results in a comma splice.

Key Concept

Identifying and correcting sentence fragments caused by dependent clauses
Estimated Time:45s
Question 205Question →

Either the head archivist or the research assistants have left his or her logs in the climate-controlled preservation room.

Which of the following options is the best replacement for the underlined portion of the sentence?

Show answer & explanation

Answer: their

Answer

The correct option is the plural possessive pronoun 'their', which matches the closer plural antecedent 'research assistants'.
The correct answer is the plural possessive pronoun 'their'. In a sentence with a compound subject joined by 'or' or 'nor' (such as 'Either the head archivist or the research assistants'), any pronoun referring back to this compound subject must agree in number with the closer of the two subjects. Because 'research assistants' is plural and is closest to the pronoun, the pronoun must be plural. The plural possessive pronoun 'their' correctly agrees with 'research assistants' and properly modifies 'logs'.

Step-by-Step Solution

1
Identify the compound subject of the sentence.
The compound subject is 'Either the head archivist or the research assistants'. It is joined by the coordinating conjunction 'or'.
Determining the structure of the subject is necessary to apply the correct agreement rules.
2
Apply the proximity rule for compound subjects joined by 'or' or 'nor'.
When a compound subject is joined by 'or' or 'nor', the verb and any subsequent pronouns must agree in number with the closer noun or pronoun in the construction.
This is the standard grammatical rule governing compound subjects joined by disjunctive conjunctions.
3
Determine the number of the closer antecedent.
The closer antecedent to the underlined pronoun is 'research assistants', which is plural.
We need to find the number of this noun to select the agreeing pronoun form.
4
Select the correct plural possessive pronoun.
The plural possessive pronoun is 'their', which correctly modifies the noun 'logs' and agrees with the plural antecedent 'research assistants'.
This pronoun satisfies both number agreement and possessive case requirements.

Key Concept

Pronoun-Antecedent Agreement with Compound Subjects
Question 206Question →

The acoustic properties of the new concert hall are far more balanced than the old theater, which suffered from excessive echo and sound distortion. Which option makes the underlined portion of the sentence logically and grammatically correct?

Show answer & explanation

Answer: those of the old theater, which suffered

Answer

The choice that states 'those of the old theater, which suffered' makes the comparison logical and is grammatically correct.
The choice that states 'those of the old theater, which suffered' is correct because it uses the plural pronoun 'those' to represent 'acoustic properties,' establishing a clear and logical comparison. It also correctly uses a comma to set off the nonessential relative clause.

Step-by-Step Solution

1
Identify the elements being compared in the sentence.
The sentence attempts to compare 'The acoustic properties of the new concert hall' to 'the old theater'.
A logical comparison must compare similar things. Here, a property of a building is incorrectly compared directly to a building.
2
Choose the pronoun that correctly replaces the noun phrase to make the comparison logical.
Since 'properties' is plural, the plural pronoun 'those' must be used: 'those of the old theater'.
This makes the sentence compare the acoustic properties of the new concert hall to the acoustic properties (those) of the old theater.
3
Ensure proper punctuation and clause structure.
The dependent clause starting with 'which' must be separated by a comma, not a semicolon, as it is nonessential.
A semicolon cannot separate a dependent clause from an independent clause.

Key Concept

Illogical and Incomplete Comparisons
Estimated Time:45s
Question 207Question →

The following passage is an excerpt from an essay about art conservation:

"The preservation of historical landmarks often requires a delicate balance between authenticity and safety. During the recent renovation of the ancient cathedral, a team of specialized conservators was tasked with stabilizing the crumbling facade. The integrity of the stained-glass windows, which date back to the twelfth century and represent some of the finest examples of Gothic art in the region, are a primary concern for the preservationists. They must ensure that the delicate leading holding the glass panes together is not compromised during the structural reinforcements."

Which of the following options is the correct replacement for the underlined word "are"?

Show answer & explanation

Answer: is

Answer

is
The singular verb 'is' correctly agrees with the singular subject 'integrity' and maintains the present tense established in the surrounding context.

Step-by-Step Solution

1
Identify the grammatical subject of the clause containing the underlined verb.
The subject is the singular noun 'integrity.' The plural nouns 'windows' and 'examples' are objects within intervening prepositional phrases and relative clauses ('of the stained-glass windows, which date back to the twelfth century and represent some of the finest examples of Gothic art in the region') and do not affect the verb's agreement.
A verb must agree in number with its true grammatical subject, not with nouns inside modifying phrases or clauses.
2
Determine the appropriate number (singular or plural) for the verb.
Since 'integrity' is singular, the verb must be singular. This eliminates the plural forms 'are' (NO CHANGE) and 'were.'
Singular subjects require singular verbs.
3
Analyze the tense of the surrounding sentences to ensure consistency.
The passage discusses general principles ('requires') and ongoing concerns ('must ensure', 'is not compromised') in the present tense. Therefore, the verb must be in the present tense ('is'), which eliminates the past-tense form 'was.'
Verb tenses must remain consistent unless there is a logical reason to shift tenses.

Key Concept

Subject-Verb Agreement
Question 208Question →

In the sentence below, which choice best corrects the underlined comparison?

The vocal ranges of opera singers are typically much wider than pop singers, who often rely on amplification to project their voices.

Show answer & explanation

Answer: those of pop singers, who often rely

Answer

The correct answer is the option that replaces the underlined text with 'those of pop singers, who often rely'. This correctly compares the vocal ranges of opera singers with 'those' (the vocal ranges) of pop singers, establishing a logical comparison.
The correct answer correctly uses the pronoun 'those' to refer back to 'the vocal ranges,' ensuring a logical and parallel comparison between the ranges of opera singers and the ranges of pop singers. Additionally, it properly uses a comma before the relative clause 'who often rely' to provide nonessential information about pop singers.

Step-by-Step Solution

1
Identify the two elements being compared in the sentence.
The sentence attempts to compare 'the vocal ranges of opera singers' to 'pop singers'.
A logical comparison must compare similar things: in this case, the vocal ranges of one group must be compared to the vocal ranges of the other group, not to the people themselves.
2
Select the option that corrects this illogical comparison while maintaining proper punctuation.
The phrase 'those of pop singers' uses the plural pronoun 'those' to refer to 'vocal ranges,' creating a logical noun-to-noun comparison, and it is punctuated correctly with a comma before the dependent clause.
This satisfies both the logic of the comparison and the rules of punctuation.

Key Concept

Illogical comparisons occur when a sentence compares two things that cannot be logically compared, such as comparing a characteristic of one group (vocal ranges) directly to the members of another group (pop singers) instead of their characteristics. Using relative pronouns like 'that of' (singular) or 'those of' (plural) corrects this error.
Question 209Question →

The new line of organic cosmetic products has received praise because of their natural ingredients.

Which option correctly replaces the underlined pronoun in the sentence?

Show answer & explanation

Answer: its

Answer

The correct answer is the singular possessive pronoun 'its' because it correctly agrees with the singular antecedent 'line'.
The correct answer is 'its'. The noun phrase 'The new line of organic cosmetic products' has the singular noun 'line' as its head. The intervening prepositional phrase 'of organic cosmetic products' contains a plural noun, but the pronoun must agree with the main singular noun 'line'. Therefore, the singular possessive pronoun 'its' is required to show possession of the natural ingredients.

Step-by-Step Solution

1
Identify the pronoun and its antecedent in the sentence.
The underlined pronoun is 'their' and its antecedent is the singular noun 'line'.
Pronouns must agree in number with their antecedents.
2
Determine the correct grammatical form of the pronoun.
The possessive pronoun must be singular, which is 'its'.
'Line' is a singular noun, so the plural pronoun 'their' is incorrect.
3
Eliminate the grammatically incorrect options.
NO CHANGE is incorrect because it retains 'their'; 'it's' is incorrect because it is a contraction of 'it is'; 'they're' is incorrect because it is a contraction of 'they are'.
Only 'its' is a singular possessive pronoun that correctly completes the sentence.

Key Concept

Pronoun-Antecedent Agreement
Question 210Question →

In 1938, physicist Lise Meitner fled Nazi Germany for Sweden, where she continued her collaboration with chemist Otto Hahn. Hahn had observed that bombarding uranium with neutrons produced barium. Although he was unable to explain this result; it was Meitner who subsequently calculated that the uranium atom had actually split, releasing vast amounts of energy. Which choice is the best replacement for the underlined portion of the sentence?

Show answer & explanation

Answer: Although he was unable to explain this result, Meitner subsequently calculated

Answer

The correct option is the one that begins with the subordinating conjunction 'Although' and uses a comma to connect the dependent clause to the main clause.
The correct option correctly uses the subordinating conjunction 'Although' to establish a dependent clause ('Although he was unable to explain this result'), which is separated by a comma from the independent main clause ('Meitner subsequently calculated that the uranium atom had actually split'). This structure properly links the two ideas and shows their contrasting relationship.

Step-by-Step Solution

1
Analyze the structure of the original sentence to identify the clauses and punctuation.
The clause beginning with 'Although' is a dependent clause, but it is followed by a semicolon and then an independent clause.
A semicolon can only connect two independent clauses, so using one after a dependent clause is incorrect.
2
Evaluate the grammar and connection of the options.
The option that changes the participle 'calculated' to 'calculating' creates a sentence fragment. The option that removes the subordinating conjunction entirely and joins the two clauses with a comma creates a comma splice.
Correct subordination requires an introductory subordinating conjunction followed by a comma and a main independent clause containing a finite verb.
3
Select the option that properly subordinates the first clause to the second while keeping both structurally complete.
The option starting with 'Although' and ending with 'subsequently calculated' forms a grammatically correct complex sentence.
It uses a comma to separate the introductory dependent clause from the complete main clause.

Key Concept

Subordination and Coordination
Question 211Question →

To evaluate the environmental impact of the new highway, the engineering firm measured local air quality, surveyed local wildlife populations, and they also analyzed runoff samples from nearby streams.

Which choice best maintains the parallel structure of the sentence?

Show answer & explanation

Answer: analyzed runoff samples from nearby streams

Answer

The correct choice is 'analyzed runoff samples from nearby streams', as it uses a past-tense verb phrase that is parallel to the preceding items in the series.
The correct choice, 'analyzed runoff samples from nearby streams', uses a simple past-tense verb followed by its direct object and a modifying prepositional phrase. This matches the grammatical structure of the first two items in the list ('measured local air quality' and 'surveyed local wildlife populations'), thereby maintaining parallel structure.

Step-by-Step Solution

1
Identify the items in the list or series within the sentence.
The list consists of three actions performed by the engineering firm: 'measured local air quality', 'surveyed local wildlife populations', and the underlined portion.
Recognizing the structure of the list establishes the pattern that must be maintained.
2
Analyze the grammatical structure of the first two items in the series.
Both 'measured local air quality' and 'surveyed local wildlife populations' are past-tense verb phrases (verb + direct object + prepositional modifier).
This establishes that the third item must also be a past-tense verb phrase to maintain parallel structure.
3
Evaluate the choices to find the one that maintains this past-tense verb phrase structure.
The choice 'analyzed runoff samples from nearby streams' matches this pattern exactly, while the other choices introduce pronouns, shifting verb forms, or comma splices.
Selecting the parallel structure ensures grammatical consistency and correctness.

Key Concept

Parallel structure requires that items in a series or list follow the same grammatical pattern (noun with noun, verb with verb, etc.) to ensure clarity and balance.
Question 212Question →

Because early wax cylinders are extremely fragile, playing them with a traditional stylus can permanently destroy the sound grooves. Instead, modern archivists use non-contact optical scanning to retrieve the audio; because this method preserves the recordings without physical contact.

Which choice most effectively and grammatically completes the underlined portion of the sentence?

Show answer & explanation

Answer: Instead, modern archivists use non-contact optical scanning to retrieve the audio, since this method

Answer

Instead, modern archivists use non-contact optical scanning to retrieve the audio, since this method
The correct option correctly uses the subordinating conjunction 'since' to introduce a dependent clause that provides the reason for the main action. The comma correctly separates the main clause from the dependent clause, maintaining proper grammatical flow and sentence structure.

Step-by-Step Solution

1
Analyze the grammatical structure and relationship between the clauses in the sentence.
The sentence contains two main ideas: archivists use optical scanning (an independent clause) and this method preserves the recordings (a reason or explanation that should be subordinate).
Understanding clause hierarchy helps identify whether coordination or subordination is required.
2
Evaluate the punctuation and conjunctions connecting the clauses in the options.
The option containing 'since this method' properly connects the independent clause with a subordinate clause explaining why scanning is used, avoiding run-ons, comma splices, or fragments.
A subordinating conjunction like 'since' or 'because' is required to make the second clause dependent, and it must be correctly linked to the main clause without isolating it as a fragment.

Key Concept

Subordination and Coordination
Question 213Question →

Many astronomers study distant stars using ground-based telescopes, others prefer space-based observatories because Earth's atmosphere does not blur the images.

Which choice best coordinates the two clauses in the underlined portion of the sentence?

Show answer & explanation

Answer: but others prefer

Answer

The correct answer is 'but others prefer', which properly uses a comma followed by a coordinating conjunction to link two independent clauses.
The correct option correctly resolves the comma splice by adding the coordinating conjunction 'but' after the comma. This grammatically connects the two independent clauses while expressing a logical contrast between astronomers using ground-based telescopes and those using space-based observatories.

Step-by-Step Solution

1
Identify the structure of the clauses surrounding the underlined portion.
The sentence consists of two independent clauses: 'Many astronomers study distant stars using ground-based telescopes' and 'others prefer space-based observatories...'
Determining whether the clauses are independent or dependent guides the correct choice of conjunction and punctuation.
2
Evaluate the original sentence (NO CHANGE) for grammatical correctness.
The original sentence joins two independent clauses with only a comma, resulting in a comma splice.
To correct a comma splice, we must add a coordinating conjunction, use a semicolon, or split them into two sentences.
3
Select the option that correctly coordinates the two independent clauses.
Adding the coordinating conjunction 'but' after the comma creates a grammatically correct compound sentence.
This establishes a clear, contrastive logical relationship between the two independent clauses.

Key Concept

Subordination and Coordination
Estimated Time:45s
Question 214Question →

The standard theory suggests that the architectural ruins of Göbekli Tepe were constructed by hunter-gatherers who had not yet settled into agricultural communities. A recent analysis of plant remains, however, which challenges this timeline by suggesting that early cultivation may have occurred parallel to the site's construction.

Which of the following choices is the best revision of the underlined portion?

Show answer & explanation

Answer: A recent analysis of plant remains, however, challenges this timeline, suggesting that early cultivation may have occurred parallel to the site's construction.

Answer

The choice that provides the main verb 'challenges' and uses the participle 'suggesting' to modify the independent clause.
The correct choice removes the relative pronoun 'which', allowing 'challenges' to serve as the main finite verb for the subject 'A recent analysis'. It then correctly uses a comma followed by the present participle 'suggesting' to introduce a modifying participial phrase, resulting in a grammatically complete and clear sentence.

Step-by-Step Solution

1
Identify the grammatical issue in the underlined portion.
The subject 'A recent analysis' is followed by a relative clause starting with 'which', leaving the main subject without a predicate verb and creating a sentence fragment.
Every complete sentence must contain at least one independent clause with a subject and a corresponding finite verb.
2
Evaluate choices to ensure a main finite verb is provided.
Removing the relative pronoun 'which' allows 'challenges' to function as the main verb, resolving the fragment.
Providing a main verb connects the subject to a complete action.
3
Check the punctuation and structure of the remaining clauses.
A comma followed by the present participle 'suggesting' correctly introduces a modifying participial phrase, avoiding comma splices and semicolon fragments.
Connecting clauses properly ensures the sentence does not violate punctuation rules like those governing independent and dependent clauses.

Key Concept

Recognizing and correcting sentence fragments caused by relative clauses that leave a main subject without a finite verb.
Estimated Time:1m 0s
Question 215Question →

Each student in the seminar, along with the professor, submitted their final research paper to the department head.

Which of the following choices best replaces the underlined portion of the sentence to ensure proper pronoun-antecedent agreement?

Show answer & explanation

Answer: his or her

Answer

The correct answer is the singular possessive pronoun phrase 'his or her' because it agrees in number with the singular antecedent 'Each student'.
The correct option is 'his or her' because the antecedent of the pronoun is 'Each student,' which is singular. Although the phrase 'along with the professor' introduces another person, it is an intervening prepositional phrase and does not change the singular subject to plural. Therefore, a singular possessive pronoun is required. Since the gender of the student is unspecified, 'his or her' is grammatically correct and appropriate.

Step-by-Step Solution

1
Identify the antecedent of the pronoun in the sentence.
The subject and antecedent is 'Each student'. The phrase 'along with the professor' is an intervening prepositional phrase and does not make the subject plural.
Finding the true antecedent is necessary to determine the correct pronoun agreement.
2
Determine the grammatical number of the antecedent.
The indefinite pronoun 'Each' is grammatically singular.
Grammatical number determines whether the pronoun must be singular or plural.
3
Select the pronoun that matches the antecedent in number and case.
The pronoun must show possession over 'final research paper', requiring a singular possessive form. The phrase 'his or her' is singular and possessive, which fits the context.
A singular possessive pronoun is required to agree with a singular antecedent and function correctly in the sentence.

Key Concept

Pronoun-Antecedent Agreement with Indefinite Pronouns
Estimated Time:1m 0s
Question 216Question →

Arrange the following sentence fragments in the correct order to construct a grammatically correct sentence that maintains a parallel structure.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

To launch the new software application, the development team must first write the core source code, then test the system for critical bugs, and finally deploy the release version to the servers.
The correct order constructs a coherent sentence where the modal verb 'must' is followed by a parallel series of base-form verbs: 'write', 'test', and 'deploy'. The transition words 'first', 'then', and 'finally' establish a clear chronological order that locks the sequence of these parallel elements.

Step-by-Step Solution

1
Identify the main clause and the governing verb.
The main clause is 'To launch the new software application, the development team must', which ends with the modal verb 'must'. This modal verb requires a base-form verb (bare infinitive) to follow it.
Establishing the main clause is necessary to determine the grammatical constraints for the rest of the sentence.
2
Identify the parallel elements and their grammatical form.
The other fragments contain actions: 'first write the core source code' (verb: 'write'), 'then test the system for critical bugs' (verb: 'test'), and 'and finally deploy the release version to the servers' (verb: 'deploy'). All three verbs are in the base form, which satisfies the parallel structure required after the modal verb 'must'.
Ensuring all items in the series share the same grammatical form (base verbs) is the core rule of parallel structure.
3
Use chronological and transitional markers to determine the correct order.
The adverbs 'first', 'then', and 'finally' indicate a chronological sequence. Therefore, 'first write...' must precede 'then test...', which must precede 'and finally deploy...'.
Transition words and logical sequencing determine the exact order of the parallel elements.

Key Concept

Parallel Structure in Compound Predicates
Question 217Question →

Archaeologists studying the ancient city of Caral in Peru have uncovered evidence of a highly developed civilization that thrived around 3000 BCE. Although the site lacks any trace of defensive walls or warfare-related weaponry. Instead, findings suggest a society built on trade, music, and agriculture, challenging the traditional view that early cities arose primarily out of a need for defense.

Which of the following choices is the best revision of the underlined portion?

Show answer & explanation

Answer: The site lacks any trace of defensive walls or warfare-related weaponry. Instead,

Answer

The option that replaces the underlined text with a complete sentence followed by a period and a capitalized transition word is correct because it eliminates the fragment without creating punctuation errors.
The correct option resolves the sentence fragment by converting the dependent clause into a grammatically complete, independent sentence and separating it from the subsequent independent clause with a period.

Step-by-Step Solution

1
Analyze the underlined portion and identify its grammatical role.
The clause 'Although the site lacks any trace of defensive walls or warfare-related weaponry' is a dependent clause due to the subordinating conjunction 'Although'. Leaving it punctuated as a complete sentence creates a sentence fragment.
Recognizing fragments is the first step to correcting them.
2
Evaluate the options to find a choice that provides a complete independent clause.
The option that removes the subordinating conjunction 'Although' and keeps the finite verb 'lacks' successfully forms an independent clause ('The site lacks...').
An independent clause must contain a subject and a finite verb and express a complete thought.
3
Verify punctuation to ensure no new errors are introduced.
Using a period to separate the two independent clauses avoids comma splices and semicolon errors.
Two independent clauses must be separated by appropriate punctuation, such as a period or a semicolon.

Key Concept

Sentence Fragments
Estimated Time:1m 0s
Question 218Question →

The following passage is about oceanographer Marie Tharp:

In the mid-twentieth century, geologist Marie Tharp created the first comprehensive map of the entire ocean floor. [1] Although her colleague Bruce Heezen initially dismissed her findings as 'girl talk,' but Tharp persisted in her analysis of sonar data to discover the Mid-Atlantic Ridge.

Which of the following options, if substituted for the underlined portion in sentence [1], would make the sentence grammatically correct?

Show answer & explanation

Answer: Although her colleague Bruce Heezen initially dismissed her findings as 'girl talk,' Tharp

Answer

Although her colleague Bruce Heezen initially dismissed her findings as 'girl talk,' Tharp
The option that removes the coordinating conjunction 'but' while keeping the subordinating conjunction 'Although' correctly subordinates the introductory clause and joins it to the main clause with a comma.

Step-by-Step Solution

1
Analyze the original sentence structure to identify the relationship between the clauses.
The sentence consists of two clauses: 'Although her colleague Bruce Heezen initially dismissed her findings as girl talk' (dependent clause) and 'Tharp persisted in her analysis of sonar data to discover the Mid-Atlantic Ridge' (independent clause).
Understanding the dependency of the clauses helps determine the correct conjunctions and punctuation needed to join them.
2
Identify the grammatical error in the original sentence.
The original sentence uses both 'Although' (a subordinating conjunction) and 'but' (a coordinating conjunction) to link the clauses. This is redundant because only one conjunction is needed to establish the relationship.
Double conjunctions violate standard rules of subordination and coordination.
3
Evaluate the answer choices to find the one that establishes a correct relationship without introducing new errors.
The option that retains 'Although' and removes 'but' correctly subordinates the first clause and allows the comma to join it to the main clause. The option without 'Although' and with just a comma creates a comma splice. The option with a semicolon creates a sentence fragment because the first clause is dependent.
A dependent clause followed by an independent clause must be joined by a comma, not a semicolon, and cannot have both subordinating and coordinating conjunctions.

Key Concept

Subordination and Coordination
Question 219Question →

After conducting a three-year study in the North Pacific, the delegation of environmental scientists presented their findings on microplastic accumulation to the United Nations committee.

Which choice best maintains standard written English conventions?

Show answer & explanation

Answer: its

Answer

The pronoun must be 'its' to agree with the singular collective noun 'delegation'.
The correct answer is the singular possessive pronoun 'its'. The antecedent is the singular collective noun 'delegation'. Although the intervening prepositional phrase 'of environmental scientists' contains the plural noun 'scientists', it does not alter the singular grammatical number of the subject. A singular possessive pronoun is required to modify 'findings'.

Step-by-Step Solution

1
Identify the antecedent that the pronoun refers to.
The antecedent is the collective noun 'delegation'.
The pronoun must show possession of the findings presented by this specific group.
2
Determine if the antecedent is singular or plural, ignoring the intervening prepositional phrase.
The noun 'delegation' is singular, and the intervening phrase 'of environmental scientists' does not affect its grammatical number.
Collective nouns are typically singular in standard written English unless the members are acting individually, which is not the case here.
3
Select the correct singular possessive pronoun that matches the non-human antecedent.
The correct pronoun is 'its'.
The possessive pronoun 'its' is singular and agrees with 'delegation', unlike the plural 'their', the contraction 'it's', or the incorrect form 'its''.

Key Concept

Pronoun-Antecedent Agreement with Collective Nouns and Intervening Phrases
Estimated Time:45s
Question 220Question →

The administrative structures of medieval merchant guilds, which regulated local trade and protected artisans' interests, were far more decentralized than modern labor unions, which typically operate under a highly centralized leadership.

Which choice completes the sentence with a logical and grammatically correct comparison?

Show answer & explanation

Answer: those of modern labor unions, which

Answer

The correct option is the phrase that includes the pronoun 'those of' followed by a comma and the relative pronoun 'which' to logically compare structures to structures while maintaining grammatical agreement.
The correct answer resolves the illogical comparison by introducing the plural pronoun 'those' (representing 'structures'), thereby comparing the administrative structures of medieval merchant guilds to the administrative structures of modern labor unions. It also uses a comma to correctly introduce the nonrestrictive relative clause.

Step-by-Step Solution

1
Identify the elements being compared in the sentence.
The sentence attempts to compare the 'administrative structures of medieval merchant guilds' to 'modern labor unions.'
To ensure logical comparison, plural structures must be compared to plural structures, not to entire organizations.
2
Select the correct pronoun to represent the plural noun 'structures'.
The plural pronoun 'those' is required to refer back to 'structures'. Using 'that' would create a singular-plural mismatch.
Using 'those of' translates to 'the structures of,' making the noun-to-noun comparison logical and parallel.
3
Verify punctuation and grammatical integration.
The relative clause beginning with 'which' is nonrestrictive and must be set off with a comma, not a semicolon, to avoid a fragment.
This confirms that the option containing 'those of' and a comma is both logically and structurally correct.

Key Concept

Illogical and Incomplete Comparisons
Estimated Time:1m 0s
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