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Question 261Question →

While researching ancient civilizations, the archaeologists focused on excavating ruins, translating inscriptions, and they wanted to document local pottery.

Which choice most effectively maintains the parallel structure of the sentence?

Show answer & explanation

Answer: documenting

Answer

documenting
The correct option is 'documenting' because it uses the gerund form, which matches the grammatical pattern of the other items in the list ('excavating' and 'translating'). This maintains parallel structure in the sentence.

Step-by-Step Solution

1
Identify the list of items in the sentence.
The list consists of three activities: 'excavating ruins', 'translating inscriptions', and the underlined portion describing the action with 'local pottery'.
Recognizing a list helps determine if parallel structure is required.
2
Analyze the grammatical form of the first two items in the list.
Both 'excavating ruins' and 'translating inscriptions' begin with a gerund (an -ing verb acting as a noun phrase).
To maintain parallel structure, the third item in the list must match this grammatical pattern.
3
Evaluate the choices to find the one that matches this pattern.
The word 'documenting' is a gerund and creates the parallel phrase 'documenting local pottery'.
Choosing 'documenting' ensures all three items in the list are grammatically parallel.

Key Concept

Parallel Structure
Estimated Time:45s
Question 262Question →

Deep-sea hydrothermal vents support bizarre ecosystems that thrive in complete darkness. These vents, which spew superheated, mineral-rich water from the ocean floor. They fuel food webs based on chemosynthesis rather than photosynthesis.

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

Show answer & explanation

Answer: These vents spew superheated, mineral-rich water from the ocean floor.

Answer

These vents spew superheated, mineral-rich water from the ocean floor.
The correct option removes the relative pronoun 'which' from the original sentence fragment, transforming it into a complete independent clause with the subject 'These vents' and the verb 'spew'.

Step-by-Step Solution

1
Analyze the underlined portion to identify if it is a complete sentence or a fragment.
The original text 'These vents, which spew superheated, mineral-rich water from the ocean floor.' is a fragment because the subject 'These vents' is followed by a relative clause starting with 'which' and lacks a main verb to complete the thought.
Identifying the grammatical structure helps determine what correction is needed to make a complete sentence.
2
Evaluate the choices to find one that creates a complete independent sentence with a subject and a verb.
Removing the relative pronoun 'which' leaves 'These vents spew...', which has a subject ('These vents') and a finite verb ('spew'), making it a grammatically correct independent sentence.
A complete sentence requires both a subject and a main verb to express a complete thought.

Key Concept

Sentence Fragments
Estimated Time:45s
Question 263Question →

For decades, astrophysicists have debated the overall geometry of the cosmos. Although the standard cosmological model suggests that the universe is flat; however, researchers continue to test alternative models because even a tiny degree of curvature would fundamentally alter our calculations regarding its ultimate fate.

Which choice best completes the sentence, establishing a clear and grammatically correct relationship between the ideas?

Show answer & explanation

Answer: Although the standard cosmological model suggests that the universe is flat, researchers continue to test

Answer

The option that correctly subordinates the first clause using 'Although' followed by a comma to introduce the main clause: 'Although the standard cosmological model suggests that the universe is flat, researchers continue to test'.
The correct option correctly uses the subordinating conjunction 'Although' to set up a dependent clause, which is separated from the independent main clause by a comma. This avoids coordination conflict and punctuation errors.

Step-by-Step Solution

1
Identify the structure of the two clauses in the sentence.
The first clause is 'Although the standard cosmological model suggests that the universe is flat' and the second is 'researchers continue to test alternative models...'
To determine whether subordination, coordination, or both are appropriate.
2
Analyze the logical relationship between the two clauses.
The relationship is one of contrast (the standard theory says it is flat, but researchers still test alternative models).
To choose the correct transition or conjunction.
3
Evaluate the options for grammatical correctness and punctuation.
The original text uses both 'Although' and 'however' with a semicolon, which is redundant and incorrectly punctuated. The option using 'however' with a comma is a comma splice. The option using 'Although' and 'but' creates a double conjunction. The option using 'Although' with a comma correctly subordinates the first clause.
To eliminate grammatically incorrect options and select the correct one.

Key Concept

Subordination and Coordination
Question 264Question →

The chemical composition of interstellar dust in the Orion Nebula, which contains complex organic molecules, is far more difficult to analyze than a typical comet in our solar system.

Which choice best corrects the underlined portion of the sentence?

Show answer & explanation

Answer: that of a typical comet in our solar system.

Answer

The correct answer is the option that replaces the underlined text with 'that of a typical comet in our solar system.' This corrects the illogical comparison by comparing the chemical composition of the dust to the chemical composition of a comet, rather than comparing a composition directly to a comet.
The correct option correctly uses the pronoun phrase 'that of' to refer back to the singular noun phrase 'the chemical composition'. This establishes a logical, parallel comparison between the chemical composition of interstellar dust and the chemical composition of a typical comet. Without this pronoun phrase, the sentence illogically compares a chemical composition to a physical comet.

Step-by-Step Solution

1
Identify the two elements being compared in the sentence.
The first element is 'The chemical composition of interstellar dust', and the second element is 'a typical comet'.
To ensure a comparison is logical, the two items being compared must be of the same type.
2
Analyze if the comparison is logical.
Comparing a 'chemical composition' (an abstract property) to a 'comet' (a physical celestial body) is illogical.
A property must be compared to another property, or a celestial body to another celestial body.
3
Find a choice that makes the comparison logical and grammatically correct.
The phrase 'that of a typical comet' uses the pronoun 'that' to represent 'the chemical composition', making the comparison logical.
This creates a parallel comparison: the chemical composition of interstellar dust is compared to the chemical composition of a typical comet.

Key Concept

Illogical comparisons occur when a sentence compares two things that are not of the same type or cannot be logically compared. In English, singular nouns are compared using the pronoun 'that of' and plural nouns using 'those of' to maintain parallel structure and clarity.
Question 265Question →

Many species of carnivorous plants grow in environments with nutrient-poor soil. The primary source of nutrients for these unique plants are the insects they capture. Over time, these plants have evolved specialized traps to survive.

Which of the following options is the correct replacement for the bolded verb to ensure proper subject-verb agreement?

Show answer & explanation

Answer: is

Answer

The correct choice is 'is' because it is singular and agrees with the singular subject 'source' in the present tense.
The choice 'is' correctly matches the singular subject 'source' and maintains the present-tense consistency established in the rest of the passage.

Step-by-Step Solution

1
Identify the subject of the sentence containing the verb in question.
The subject is 'The primary source', which is a singular noun phrase.
The prepositional phrase 'of nutrients for these unique plants' separates the subject from the verb but does not change the subject's grammatical number.
2
Determine the correct verb form that agrees with the subject and fits the tense of the passage.
The verb must be singular and in the present tense to match 'source' and coordinate with the other present-tense verbs in the passage like 'grow' and 'capture'. The correct form is 'is'.
Subject-verb agreement requires singular subjects to pair with singular verbs, and tense consistency requires keeping the sentence in the present tense.

Key Concept

Subject-verb agreement with intervening prepositional phrases
Question 266Question →

For decades, the migration patterns of the monarch butterfly baffled entomologists. Although researchers knew the insects traveled thousands of miles south each autumn, how they navigated to the exact same high-altitude forests in Mexico remained unclear. Modern studies reveal that monarchs use a solar compass, which adjusts for the time of day, and their descent is guided by magnetic cues.

Which of the following alternatives to the underlined portion is most grammatically correct and consistent with the tone and structure of the sentence?

Show answer & explanation

Answer: and rely on magnetic cues to guide their descent.

Answer

and rely on magnetic cues to guide their descent.
The correct option maintains the active voice and parallel structure established in the first clause. By coordinating the present-tense verb 'rely' with 'use', the sentence maintains 'monarchs' as the single subject of both actions and avoids any shift in construction.

Step-by-Step Solution

1
Identify the subject and voice of the first main clause in the coordinate sentence.
The subject is 'monarchs' and the verb 'use' is active.
Establishing the initial structure of the sentence determines the parallel pattern that should follow.
2
Analyze the underlined portion for shifts in construction relative to the first clause.
The underlined portion shifts to a passive verb form ('is guided') and changes the grammatical subject to 'their descent'.
Identifying this shift reveals the error in construction and parallelism that needs correction.
3
Evaluate the choices to find the one that maintains consistency in both voice and subject.
The option containing 'rely on magnetic cues' maintains the active voice and allows 'monarchs' to remain the implied subject of the coordinate verb.
A coordinate predicate using the active-voice verb 'rely' perfectly parallels 'use', avoiding any awkward shifts in construction.

Key Concept

Shifts in Construction
Question 267Question →

Read the sentence below, which describes the tasks of archaeologists. Fill in the blank with the correct form of the verb 'analyze' so that the sentence maintains a parallel grammatical structure. What is the correct form of the verb?

Fill in the blanks below

During the excavation of the ancient ruins, the archaeologists spent their afternoons carefully washing fragile pottery shards, meticulously documenting the location of each artifact, and systematically the chemical composition of the soil samples.
Show answer & explanation

Answer

analyzing (or analysing)
The correct answer is 'analyzing' (or 'analysing' in British English) because it is a gerund, which matches the grammatical form of the other activities listed in the sentence: 'washing' and 'documenting'. This consistency is required to maintain parallel structure in a series.

Step-by-Step Solution

1
Identify the elements of the list in the sentence that must be parallel.
The sentence lists three activities the archaeologists spent their afternoons doing: 'carefully washing fragile pottery shards,' 'meticulously documenting the location of each artifact,' and 'systematically [analyzing] the chemical composition of the soil samples.'
Parallel structure requires that items in a list or series share the same grammatical form.
2
Analyze the grammatical structure of the established items in the series.
The first two items in the series, 'washing' and 'documenting,' are gerunds (-ing verb forms acting as nouns/modifiers in participle phrases).
Determining the grammatical pattern of the existing list items establishes the required pattern for the missing item.
3
Determine the correct form of the target verb 'analyze' to match the established pattern.
To match the gerunds 'washing' and 'documenting,' the verb 'analyze' must also be in its gerund form, which is 'analyzing' (or 'analysing' in British English).
Using the gerund form 'analyzing' completes the parallel structure, ensuring all three elements in the series are grammatically consistent.

Key Concept

Parallel Structure in a Series
Question 268Question →

Many species of slime mold, such as *Physarum polycephalum*, exhibit primitive intelligence despite being single-celled organisms. When placed in a maze with food at two different exits, the mold will grow to fill the entire space, eventually retracting its branches from dead ends to leave a single, efficient connection. Although the organism lacks a brain or any nervous system. It manages to find the shortest path between the nutrient sources by utilizing a chemical memory of the paths it has already explored.

Which of the following choices best corrects the grammatical error in the underlined portion?

Show answer & explanation

Answer: Although the organism lacks a brain or any nervous system, it

Answer

The correct choice is the option that connects the introductory dependent clause to the main independent clause using a comma: 'Although the organism lacks a brain or any nervous system, it'.
The clause starting with the subordinating conjunction 'Although' is dependent and cannot stand alone as a complete sentence. Changing the period to a comma and changing the capital 'It' to a lowercase 'it' correctly joins this introductory dependent clause to the main independent clause that follows it.

Step-by-Step Solution

1
Identify the grammatical structure of the underlined portion.
The clause beginning with 'Although' is a dependent clause because it starts with a subordinating conjunction and cannot stand alone as a complete sentence.
This helps determine why the original punctuation (a period) creates a sentence fragment.
2
Evaluate how to connect the dependent clause to the subsequent independent clause.
An introductory dependent clause must be followed by a comma before the independent clause begins.
Connecting them with a comma creates a grammatically complete, complex sentence.
3
Eliminate incorrect punctuation choices.
Using a semicolon is incorrect because semicolons only link two independent clauses. Removing the subordinating conjunction entirely creates two independent clauses separated only by a comma, resulting in a comma splice.
This confirms that only the comma-connected option is grammatically sound.

Key Concept

Identifying and correcting sentence fragments by properly linking dependent clauses to independent clauses.
Estimated Time:50s
Question 269Question →

The nesting habits of the piping plover, a small shorebird that breeds on sandy beaches, are much more difficult to study than an emperor penguin, researchers must endure extreme weather conditions to observe the latter.

Which choice best corrects the underlined portion of the sentence?

Show answer & explanation

Answer: those of the emperor penguin; researchers

Answer

The choice that changes the underlined text to 'those of the emperor penguin; researchers' is correct because it establishes a logical comparison between the nesting habits of the two birds and uses a semicolon to avoid a comma splice.
The correct answer correctly uses the plural pronoun 'those' to refer to 'nesting habits,' creating a logical comparison between the nesting habits of the piping plover and the nesting habits of the emperor penguin. Additionally, it uses a semicolon to separate the two independent clauses, which resolves the comma splice.

Step-by-Step Solution

1
Identify the items being compared in the sentence.
The sentence compares 'the nesting habits of the piping plover' to 'an emperor penguin'.
To be grammatically logical, a comparison must compare similar things: in this case, nesting habits must be compared to other nesting habits, not to a bird.
2
Identify the pronoun needed to represent the compared plural noun and the appropriate punctuation to join the clauses.
The plural pronoun 'those' is needed to refer to the plural noun 'habits', and a semicolon is required to separate the two independent clauses.
Using 'those of' makes the comparison logical and parallel, and using a semicolon prevents a comma splice.

Key Concept

Illogical and Incomplete Comparisons
Question 270Question →

Which pronoun correctly completes the sentence below to ensure proper pronoun-antecedent agreement?

Fill in the blanks below

Each of the candidate countries, in order to comply with the new environmental treaty, must submit national carbon emissions report by the end of the fiscal year.
Show answer & explanation

Answer

its
The correct pronoun is 'its'. Under standard written English rules, the indefinite pronoun 'Each' is singular and requires a singular pronoun for agreement. The plural noun 'countries' in the prepositional phrase 'of the candidate countries' does not change the singular nature of the subject. Because countries are non-human entities, the singular, gender-neutral possessive pronoun 'its' is correct.

Step-by-Step Solution

1
Identify the true grammatical antecedent of the missing pronoun.
The antecedent is the singular indefinite pronoun 'Each'.
The prepositional phrase 'of the candidate countries' is an intervening modifier and does not affect the grammatical number of the subject 'Each'.
2
Select the pronoun that agrees in number and gender with the antecedent.
Use the singular, gender-neutral possessive pronoun 'its'.
Since the antecedent 'Each' is singular and refers to nations (neuter/inanimate entities), it requires the singular pronoun 'its' to ensure grammatical agreement.

Key Concept

Pronoun-Antecedent Agreement
Question 271Question →

In 1964, radio astronomers Arno Penzias and Robert Wilson were troubled by a persistent background hiss in their Holmdel horn antenna. Although they meticulously cleaned the equipment and even removed nesting pigeons, but the mysterious static remained.

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

Show answer & explanation

Answer: They meticulously cleaned the equipment and even removed nesting pigeons,

Answer

They meticulously cleaned the equipment and even removed nesting pigeons,
The correct option removes the subordinating conjunction 'Although' from the first clause, which allows it to stand alone as an independent clause. This independent clause is then properly connected to the second independent clause by the comma and the coordinating conjunction 'but', forming a grammatically sound compound sentence.

Step-by-Step Solution

1
Identify the relationship between the clauses and locate any conjunctions.
The sentence attempts to connect two clauses: one about cleaning the equipment and the other about the static remaining. The first clause begins with the subordinating conjunction 'Although', and the second clause begins with the coordinating conjunction 'but'.
This helps determine if the sentence contains coordination or subordination errors, such as using multiple contrasting conjunctions.
2
Evaluate the grammatical structure of the sentence.
Using both 'Although' (subordinating) and 'but' (coordinating) in the same sentence structure is redundant and grammatically incorrect. It leaves the entire construction without an independent main clause, creating a fragment.
To diagnose the specific grammatical error that needs correction.
3
Determine the correct way to join these clauses.
To fix the error, one of the conjunctions must be removed. Since 'but' is not underlined, we must remove 'Although' from the underlined portion. This leaves a complete independent clause joined to another independent clause by a comma and 'but', forming a proper compound sentence.
To select the choice that establishes correct sentence structure and maintains the logical contrast.

Key Concept

Subordination and Coordination
Question 272Question →

During the excavation of the ancient Roman villa, archaeologists focused not only on uncovering intact mosaics but also on the documentation of the site's structural foundations.

Which of the following choices best maintains parallel structure in the sentence?

Show answer & explanation

Answer: on documenting

Answer

on documenting
The correct choice is 'on documenting' because it establishes parallel structure with the first part of the correlative construction. The phrase 'not only on uncovering' uses the preposition 'on' followed by a gerund ('uncovering'). To maintain parallelism, the phrase following 'but also' must use the same structure: the preposition 'on' followed by the gerund 'documenting'.

Step-by-Step Solution

1
Identify the correlative conjunction and the grammatical structure of the first element.
The sentence uses the correlative conjunction 'not only... but also'. The phrase immediately following 'not only' is 'on uncovering intact mosaics', which is a prepositional phrase containing the gerund 'uncovering'.
Parallel structure requires that elements joined by correlative conjunctions share the same grammatical form.
2
Analyze the underlined portion following 'but also' to check for parallel structure.
The underlined phrase 'on the documentation of' is a prepositional phrase containing the noun 'documentation', which is not parallel to the gerund 'uncovering'.
To maintain parallelism, the second element must also be a prepositional phrase with the preposition 'on' followed by a gerund.
3
Evaluate the choices to find the one that uses a gerund phrase beginning with the preposition 'on'.
The phrase 'on documenting' matches 'on uncovering' in both preposition and gerund form.
This maintains grammatical balance and clarity across the sentence.

Key Concept

Parallel Structure with Correlative Conjunctions
Question 273Question →

Which pronoun correctly completes the sentence to ensure proper pronoun-antecedent agreement?

Fill in the blanks below

Before embarking on the international tour, the symphony orchestra, which had recently hired a new conductor, rehearsed final program for three consecutive days.
Show answer & explanation

Answer

its
The singular collective noun 'symphony orchestra' acts as a single unit in this context, so it requires the singular possessive pronoun 'its' to achieve proper agreement.

Step-by-Step Solution

1
Identify the antecedent of the pronoun.
The antecedent is 'the symphony orchestra'.
The pronoun represents the owner of the final program rehearsed by the orchestra.
2
Determine the grammatical number of the antecedent.
The noun phrase 'the symphony orchestra' is a singular collective noun.
It refers to a single collective organization acting as a single unit.
3
Determine the proper pronoun case and form.
A possessive pronoun is needed to modify the noun 'program'.
The pronoun indicates ownership of the final program.
4
Select the correct singular possessive pronoun.
The pronoun 'its' is singular and possessive.
It agrees with 'symphony orchestra' in number and demonstrates ownership.

Key Concept

Pronoun-Antecedent Agreement
Estimated Time:45s
Question 274Question →

In 1967, astrophysicist Jocelyn Bell Burnell noticed a strange, repeating signal in her telescope data. Although many of her colleagues initially dismissed the anomaly as man-made interference, but Burnell insisted on analyzing the pulsing radio waves more closely. Her persistence led to the discovery of pulsars, rapidly rotating neutron stars that emit beams of electromagnetic radiation.

Which choice best coordinates or subordinates the clauses in the underlined portion to maintain a grammatically correct sentence structure?

Show answer & explanation

Answer: Although many of her colleagues initially dismissed the anomaly as man-made interference, Burnell insisted

Answer

Although many of her colleagues initially dismissed the anomaly as man-made interference, Burnell insisted
The correct choice properly subordinates the first clause with the subordinating conjunction 'Although' and links it to the main independent clause using a comma. This avoids the grammatical redundancy of having both a subordinator and a coordinator in the same sentence.

Step-by-Step Solution

1
Analyze the structural relationship between the clauses in the sentence.
The first part of the sentence contains a dependent clause ('Although many of her colleagues initially dismissed the anomaly as man-made interference') and the second part contains an independent clause ('Burnell insisted on analyzing the pulsing radio waves more closely').
Understanding the clause types determines whether subordination or coordination is appropriate.
2
Identify any coordination or subordination errors in the original underlined phrasing.
The original phrasing uses both the subordinating conjunction 'Although' and the coordinating conjunction 'but' for the same relationship, which is grammatically redundant.
A dependent clause introduced by a subordinator cannot be joined to an independent clause using a coordinating conjunction.
3
Evaluate the remaining options to find the correct grammatical connection.
Removing the coordinator 'but' while keeping 'Although' correctly forms a complex sentence. Removing the subordinator 'Although' without adding a proper coordinator or semicolon leads to a comma splice. Using a semicolon before 'because' results in a dependent clause fragment.
To ensure the selected option is free of grammatical errors like comma splices or fragments.

Key Concept

Subordination and Coordination
Estimated Time:1m 0s
Question 275Question →

A writer wants to construct a logically ordered sentence about a committee's project steps while maintaining parallel grammatical structure. Order the following sentence segments to build this sentence, starting with the introductory clause.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The sentence segments must be ordered: 'Before starting the initiative, the committee focused on', followed by 'drafting the initial proposal,', then 'securing the necessary funding,', and finally 'and executing the project plan.'
The correct order begins with the main clause 'Before starting the initiative, the committee focused on' to establish the grammatical structure. It is followed by the parallel gerund phrases in chronological order: 'drafting the initial proposal,' then 'securing the necessary funding,' and ending with 'and executing the project plan.'

Step-by-Step Solution

1
Identify the segment that contains the main subject and verb to introduce the sentence.
'Before starting the initiative, the committee focused on' must come first because it provides the introductory main clause and ends with the preposition 'on'.
This sets up the grammatical frame for the subsequent list of parallel activities that will follow the preposition.
2
Arrange the remaining gerund phrases in a logical chronological sequence.
The logical progression of a project is first drafting the proposal, then securing funding, and finally executing the plan.
Chronological and logical flow dictates that a proposal must be written before funding is secured, and funding must be secured before the plan is executed.
3
Verify that all items in the list maintain parallel grammatical structure.
The sequence 'drafting...', 'securing...', and 'executing...' consists entirely of parallel gerund phrases.
This satisfies the rules of parallel structure by using the same grammatical form (-ing verbs) for all items in the series.

Key Concept

Parallel structure requires that items in a series or list follow the same grammatical form (e.g., all gerunds, all infinitives, or all clauses) to maintain clarity and rhythm.
Question 276Question →

Unlike the warm, salty waters of the Mediterranean, the Baltic Sea is remarkably brackish and cold. Because its low salinity prevents the growth of shipworms. These destructive wood-boring clams would otherwise devour wooden shipwrecks within a few decades.

Which of the following options, if substituted for the underlined portion, makes the sentence grammatically correct?

Show answer & explanation

Answer: cold, because its

Answer

Unlike the warm, salty waters of the Mediterranean, the Baltic Sea is remarkably brackish and cold, because its low salinity prevents the growth of shipworms.
The correct option connects the dependent clause beginning with the subordinating conjunction 'because' to the preceding independent clause using a comma, resulting in a single, grammatically complete sentence.

Step-by-Step Solution

1
Analyze the underlined portion and the surrounding clauses to determine if a sentence fragment is present.
The clause 'Because its low salinity prevents the growth of shipworms' begins with a subordinating conjunction ('Because') and contains no independent main clause, making it a dependent clause fragment.
Identifying the grammatical nature of the clauses is necessary to determine what punctuation or conjunction is needed to connect them.
2
Evaluate the options to find a grammatically correct way to link the dependent clause to the main clause.
Connecting the dependent clause to the preceding independent clause ('the Baltic Sea is remarkably brackish and cold') with a comma and the lowercase conjunction 'because' resolves the fragment.
A dependent clause starting with a subordinating conjunction should be attached to an independent clause to form a complete, grammatically correct sentence.
3
Verify that the other choices do not introduce new errors like semicolon fragments or comma splices.
The option with a semicolon creates a semicolon fragment because a semicolon must separate two independent clauses. The option with 'cold, its' creates a comma splice because it links two independent clauses with only a comma.
Checking all options ensures that the selected choice is the only grammatically correct and appropriate solution.

Key Concept

Sentence Fragments and Clause Coordination
Question 277Question →

The following passage contains two blanks where verb forms are missing. What are the correct present-tense forms of the verbs that should fill these blanks to maintain proper subject-verb agreement?

Fill in the blanks below

Each of the linguistic features discovered in the isolated valley that the language developed independently of neighboring dialects. Indeed, a team of researchers, accompanied by local guides and translators, the phonology of this unique tongue to document its history.
Show answer & explanation

Answer

The correct verb forms are 'suggests' for the first blank and 'studies' for the second blank.
For the first blank, 'suggests' is correct because the subject is 'Each', which is a singular indefinite pronoun. The modifying prepositional phrase 'of the linguistic features' does not change the number of the subject. For the second blank, 'studies' is correct because the subject is the collective noun 'team', which is singular. The parenthetical phrase 'accompanied by local guides and translators' does not affect the number of the main subject.

Step-by-Step Solution

1
Identify the subject and its grammatical number for the first blank.
The subject is the indefinite pronoun 'Each', which is grammatically singular.
The prepositional phrase 'of the linguistic features' contains a plural noun but acts only as a modifier; it does not change the singular nature of the subject 'Each'.
2
Select the correct present-tense verb form for the first blank.
The singular verb form 'suggests' is chosen.
A singular subject requires a singular verb form to maintain proper subject-verb agreement.
3
Identify the subject and its grammatical number for the second blank.
The subject is the collective noun 'team', which is singular in this context.
The parenthetical phrase 'accompanied by local guides and translators' is set off by commas and does not alter the singular grammatical number of the subject 'team'.
4
Select the correct present-tense verb form for the second blank.
The singular verb form 'studies' is chosen.
A singular subject requires a singular verb form to maintain proper subject-verb agreement.

Key Concept

Subject-verb agreement with indefinite pronouns, collective nouns, and intervening prepositional or parenthetical phrases.
Question 278Question →

The following passage is an excerpt from an essay on ancient Mesopotamian history.

Archaeologists study cuneiform to understand ancient administration. Every one of the clay tablets recovered from the ancient library of Ashurbanipal, despite suffering extensive water damage over the millennia, provide invaluable insights into Mesopotamian trade agreements. Today, these texts help historians reconstruct early economic networks.

Which of the following choices is the best replacement for the underlined word?

Show answer & explanation

Answer: provides

Answer

provides
The correct answer is the singular, present-tense verb 'provides' because it agrees with the singular subject 'Every one'. The intervening prepositional phrases containing plural nouns do not change the subject, and the present tense maintains consistency with the surrounding text.

Step-by-Step Solution

1
Identify the grammatical subject of the clause containing the underlined verb.
The subject is the indefinite pronoun 'Every one', which is singular.
Determining whether the subject is singular or plural is essential to establish correct subject-verb agreement.
2
Examine the intervening phrases between the subject and the verb.
The phrase 'of the clay tablets recovered from the ancient library of Ashurbanipal, despite suffering extensive water damage over the millennia' contains plural nouns ('tablets', 'millennia') but does not change the singular nature of the subject 'Every one'.
Intervening prepositional phrases and modifiers do not alter the number of the subject.
3
Select the verb form that agrees in number and maintains tense consistency.
The singular, present-tense verb 'provides' matches 'Every one' and aligns with the present tense established in the surrounding sentences ('study', 'help').
This resolves the grammatical error without introducing tense inconsistency.

Key Concept

Subject-verb agreement with intervening prepositional phrases and indefinite pronouns.
Question 279Question →

Read the passage below, which contains verbs in parentheses. Complete the passage by typing the correct present-tense form of each verb in the corresponding blank to ensure proper subject-verb agreement.

Fill in the blanks below

The study of bioluminescent organisms in the deep ocean has revealed fascinating evolutionary adaptations. Hovering near the hydrothermal vents of the Mariana Trench (to be) a swarm of predatory comb jellies, whose delicate structure, in addition to their glowing cilia, (to baffle) marine biologists. Neither the team's chief investigator nor the sensor technicians (to believe) that these organisms can survive at such extreme pressures.
Show answer & explanation

Answer

The correct present-tense verb forms are 'is' for the first blank, 'baffles' for the second blank, and 'believe' for the third blank.
The verb in the first blank must be 'is' to agree with the singular subject 'swarm' in the inverted clause. The verb in the second blank must be 'baffles' to agree with the singular subject 'structure', as the parenthetical phrase does not change the subject's grammatical number. The verb in the third blank must be 'believe' to agree with 'technicians', which is the closer subject in the 'neither... nor...' construction.

Step-by-Step Solution

1
Determine the subject and correct verb form for the first blank.
The verb form is 'is'.
The sentence has an inverted structure where the verb precedes the subject. The subject is 'a swarm', which is a singular collective noun. Modifying prepositional phrases like 'of predatory comb jellies' do not change the number of the subject. Therefore, the verb must be singular.
2
Determine the subject and correct verb form for the second blank.
The verb form is 'baffles'.
The subject of the relative clause is 'structure', which is singular. The parenthetical prepositional phrase 'in addition to their glowing cilia' does not alter the number of the subject. Thus, the verb must be singular.
3
Determine the subject and correct verb form for the third blank.
The verb form is 'believe'.
The subjects are joined by the correlative conjunction 'neither... nor...'. In this construction, the verb must agree with the subject closest to it. The closest subject is 'technicians', which is plural, so the verb must be plural.

Key Concept

Subject-Verb Agreement with Inverted Syntax, Intervening Phrases, and Correlative Conjunctions
Estimated Time:1m 30s
Question 280Question →

The following passage is an excerpt from a science article about ecosystems.

Peatlands function as highly efficient carbon sinks, storing more carbon than all of the world's forests combined. Although they cover only three percent of the Earth's land surface.

Which of the following choices is the most grammatically correct revision of the underlined portion of the passage?

Show answer & explanation

Answer: combined, although they cover only three percent of the Earth's land surface.

Answer

combined, although they cover only three percent of the Earth's land surface.
The correct option correctly joins the dependent clause starting with 'although' to the main independent clause using a comma. This resolves the sentence fragment without introducing any punctuation errors.

Step-by-Step Solution

1
Identify the grammatical structures of the two clauses in the sentence.
The first clause ('Peatlands function as highly efficient carbon sinks, storing more carbon than all of the world's forests combined') is independent. The second clause ('Although they cover only three percent of the Earth's land surface') starts with the subordinating conjunction 'Although' and is dependent.
Understanding clause types is necessary to choose the correct punctuation to join them.
2
Evaluate the original sentence structure in the passage.
A period separates the independent clause from the dependent clause, turning the dependent clause into a sentence fragment.
To test if the original text is correct or needs revision.
3
Evaluate the options to find the grammatically correct connection.
Using a semicolon before 'although' is incorrect because a semicolon must join two independent clauses. Removing 'although' and using a comma creates a comma splice because it joins two independent clauses without a coordinating conjunction. Connecting the dependent clause to the independent clause using a comma and 'although' correctly forms a single complex sentence.
To eliminate grammatically incorrect options and select the correct answer.

Key Concept

Sentence Fragments
Estimated Time:1m 0s
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