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Question 1Question →

Read the passage below. The first sentence contains a nonessential parenthetical phrase that is introduced by a dash. What punctuation mark should be placed in the blank to maintain punctuation consistency and correctly set off this phrase?

Fill in the blanks below

In 1974, a team of glaciologists embarked on a pioneering expedition to retrieve ice cores from the Quelccaya Ice Cap—the largest ice mass in the tropicshoping to reconstruct a detailed history of the region's climate. The ancient ice contains dust particles, volcanic ash, and chemical signatures that reveal past weather patterns. By analyzing these layers, the scientists successfully created a year-by-year climate record spanning over fifteen centuries.
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Answer

A dash (—)
The sentence contains a nonessential parenthetical phrase, 'the largest ice mass in the tropics,' which describes the 'Quelccaya Ice Cap.' Under standard conventions, nonessential phrases must be enclosed by matching punctuation marks (either a pair of commas, a pair of parentheses, or a pair of dashes). Because the phrase begins with a dash after 'Quelccaya Ice Cap,' it must end with a matching dash before 'hoping' to ensure consistency and grammatical correctness.

Step-by-Step Solution

1
Identify the parenthetical (nonessential) phrase in the sentence.
The phrase 'the largest ice mass in the tropics' provides extra, nonessential information about the 'Quelccaya Ice Cap'.
Recognizing the structure of the sentence helps determine which punctuation rules apply.
2
Observe the punctuation mark that introduces the parenthetical phrase.
The parenthetical phrase is introduced by an em dash (—).
Parenthetical elements must be set off by matching punctuation marks.
3
Determine the correct punctuation mark to close the parenthetical phrase.
To match the opening dash and maintain punctuation consistency, the phrase must be closed with a dash.
Mixing a dash with a comma or parenthesis is incorrect under standard ACT punctuation conventions.

Key Concept

Punctuation consistency with parenthetical elements (dashes)
Question 2Question →

The passage below contains a sentence with a missing punctuation mark. Read the passage and determine the correct punctuation mark needed to complete the sentence. Which punctuation mark must fill the blank to ensure proper punctuation consistency?

Fill in the blanks below

The majestic monarch butterfly—known for its vibrant orange and black wingsembarks on a spectacular multi-generational migration across North America.
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Answer

A dash (—)
The correct punctuation mark is a dash. The sentence contains a nonessential phrase, 'known for its vibrant orange and black wings', which is introduced by a dash. To maintain grammatical consistency, a matching dash must be used to close the parenthetical phrase before the main verb 'embarks'.

Step-by-Step Solution

1
Identify the structure of the sentence and locate the parenthetical (nonessential) modifier.
The phrase 'known for its vibrant orange and black wings' provides extra description of the butterfly and is nonessential to the main clause.
Identifying the nonessential modifier helps determine which punctuation marks are required to set it off from the rest of the sentence.
2
Check the punctuation mark that introduces the nonessential modifier.
The modifier begins with an em dash (—).
To maintain grammatical consistency, the punctuation mark used to open a nonessential phrase must match the punctuation mark used to close it.
3
Select the correct punctuation mark to close the nonessential modifier.
A matching em dash (—) must fill the blank.
Using another punctuation mark, such as a comma, would create an ungrammatical mismatch.

Key Concept

Dash consistency in setting off nonessential clauses
Question 3Question →

Read the passage below. What punctuation mark should be placed in the blank to grammatically complete the sentences?

Fill in the blanks below

In his book on the history of culinary arts, the author wonders why the fork took so many centuries to become a standard utensil in Western Europe Apparently, medieval nobility considered it an unnecessary and even effeminate luxury.
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Answer

A period (.) is the correct punctuation mark to terminate the first sentence.
The correct punctuation mark is a period. The clause preceding the blank contains an indirect question ('the author wonders why...'), which functions as a declarative statement and must end with a period rather than a question mark. Furthermore, the capitalized word following the blank indicates the start of a new independent clause, requiring a full sentence termination.

Step-by-Step Solution

1
Analyze the structure of the clause preceding the blank.
The clause 'the author wonders why the fork took so many centuries to become a standard utensil in Western Europe' functions as an indirect question.
Indirect questions are statements rather than direct inquiries and must be terminated with a period, not a question mark.
2
Analyze the clause succeeding the blank.
The clause 'Apparently, medieval nobility considered it an unnecessary and even effeminate luxury' is a complete independent clause starting with a capitalized word.
This shows that the two clauses are separate sentences and cannot be joined by a comma or left unpunctuated.
3
Select the correct punctuation mark.
A period is the correct punctuation mark to terminate the statement.
A period resolves the boundary between the two independent clauses without introducing errors.

Key Concept

End-of-Sentence Punctuation for Indirect Questions
Estimated Time:1m 0s
Question 4Question →

Identify the punctuation mark that must be placed in the blank to grammatically join the two independent clauses in the sentence below.

Fill in the blanks below

Physarum polycephalum is a single-celled organism that lacks a brain or central nervous system nevertheless, the slime mold can solve complex mazes and remember the shortest paths to food sources.
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Answer

semicolon (represented by the symbol ';')
A semicolon is the correct punctuation mark to join two independent clauses when the second clause begins with a transitional adverb like 'nevertheless'. This structure requires a semicolon before the transition and a comma after it.

Step-by-Step Solution

1
Analyze the clauses on both sides of the blank to determine if they are independent.
The clause before the blank ('Physarum polycephalum is a single-celled organism that lacks a brain or central nervous system') and the clause after the blank ('nevertheless, the slime mold can solve complex mazes and remember the shortest paths to food sources') are both independent clauses because they can each stand alone as a complete sentence.
Identifying the clause type is necessary to determine the appropriate punctuation to join them.
2
Identify the transition word initiating the second clause.
The word 'nevertheless' is a conjunctive adverb (transitional adverb).
Conjunctive adverbs require specific punctuation configurations when used to link independent clauses.
3
Determine the correct punctuation mark that must precede the conjunctive adverb.
A semicolon must be placed in the blank to separate the two independent clauses before the conjunctive adverb.
Joining two independent clauses with only a comma before a transitional adverb creates a comma splice, and using no punctuation is run-on.

Key Concept

Using a semicolon to link independent clauses connected by transitional adverbs.
Question 5Question →

In the passage below, a punctuation mark is missing. Fill in the blank with the correct punctuation mark (such as a comma, semicolon, colon, or dash) that should be placed in the sentence to ensure it is grammatically correct and internally consistent.

Fill in the blanks below

Although Michael Ventris is often credited with deciphering Linear B, the historic breakthrough relied heavily on the meticulous preparation of classicist Alice Kober. For years, Kober cataloged the symbols on hand-cut index cards—which she stored in cardboard boxes due to wartime paper shortages to identify patterns in the script's inflected grammatical endings. Her rigorous analysis ultimately proved that Linear B represented an inflected Indo-European language, setting the stage for its final decipherment.
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Answer

An em dash (—) is required to close the nonessential parenthetical clause that was introduced by the preceding em dash.
A dash is required to maintain consistency with the em dash that introduces the nonessential parenthetical clause ('which she stored in cardboard boxes due to wartime paper shortages'). In English grammar, parenthetical elements must be set off by matching punctuation marks: either a pair of commas, a pair of parentheses, or a pair of dashes. Since the clause begins with a dash after 'cards', it must end with a dash before 'to identify'.

Step-by-Step Solution

1
Identify the syntactic structure of the sentence containing the blank.
The phrase 'which she stored in cardboard boxes due to wartime paper shortages' is a nonessential parenthetical clause describing the index cards.
Identifying parenthetical elements is necessary to determine the appropriate punctuation rules.
2
Check the punctuation mark that introduces the nonessential parenthetical clause.
The clause is introduced by an em dash (—) after the word 'cards'.
Standard grammar rules dictate that punctuation setting off a parenthetical element must be consistent at both the beginning and the end.
3
Apply the rule of punctuation consistency to select the closing punctuation mark.
Because the parenthetical clause begins with an em dash, it must also end with an em dash (—).
Mismatching punctuation marks (for example, starting a parenthetical element with a dash and ending it with a comma) is incorrect.

Key Concept

Consistent punctuation for nonessential clauses using dash pairs
Estimated Time:1m 0s
Question 6Question →

Read the passage below. Which punctuation mark must be placed in the blank to correctly terminate the first sentence?

Fill in the blanks below

Many historians have investigated the clandestine operations at Bletchley Park during World War II. For instance, did the Allied command truly expect Alan Turing to crack the complex German cipher codes within a few months Turing's revolutionary Bombe machine exceeded all expectations and shortened the war by years.
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Answer

A question mark is the correct punctuation mark to terminate the sentence.
A question mark is the only grammatically correct option because the sentence preceding the blank ('For instance, did the Allied command...') is a direct question, as indicated by the subject-verb inversion ('did the Allied command...').

Step-by-Step Solution

1
Analyze the structure of the clause preceding the blank.
The clause 'For instance, did the Allied command truly expect Alan Turing to crack the complex German cipher codes within a few months' begins with the auxiliary verb 'did' followed by the subject 'the Allied command'.
Identifying the subject-verb inversion helps determine if the clause functions as a direct question.
2
Determine the sentence type of the clause.
The clause is a direct question because it inquires about the expectations of the Allied command.
Direct questions must be terminated with a question mark to indicate the interrogative tone and structure.
3
Select the appropriate end-of-sentence punctuation mark.
A question mark is required to correctly terminate this interrogative sentence before the next independent clause begins with a capitalized letter.
Using a period or a comma would create a grammatical error and misrepresent the sentence structure.

Key Concept

Direct questions must be terminated with a question mark rather than a period or comma.
Estimated Time:45s
Question 7Question →

Which word from the pair 'mitigate' and 'militate' correctly fills each blank in the sentence below?

Fill in the blanks below

Although the municipal committee hoped the new zoning laws would the environmental impact of rapid urban expansion, several economic factors threatened to against the success of the initiative.
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Answer

The first blank must be filled with 'mitigate' and the second blank must be filled with 'militate'.
The word 'mitigate' is a transitive verb meaning to alleviate or lessen, which correctly fits the first blank as it takes 'the environmental impact' as its direct object. The word 'militate' is an intransitive verb meaning to work or exert influence against something, which correctly fits the second blank and aligns with the preposition 'against' in the phrase 'militate against the success.'

Step-by-Step Solution

1
Define the meanings of the target words.
The verb 'mitigate' means to make less severe, serious, or painful (to alleviate). The verb 'militate' means to be a powerful or conclusive factor in preventing or acting against something, and it is almost always followed by the preposition 'against'.
Establishing definitions is necessary to determine which word fits the semantic and syntactic context of each blank.
2
Analyze the syntactic and semantic context of the first blank.
The first blank requires a transitive verb that can take the direct object 'the environmental impact.' Since the goal is to lessen the negative impact, 'mitigate' is the correct fit.
This determines the correct word for the first blank.
3
Analyze the syntactic and semantic context of the second blank.
The second blank is followed by the preposition 'against' and describes how economic factors act to prevent the success of the initiative. The verb 'militate' fits this structure and meaning perfectly.
This determines the correct word for the second blank.

Key Concept

Frequently Confused Words (Mitigate vs. Militate)
Estimated Time:1m 30s
Question 8Question →

In the English language, modifier placement is crucial for clarity. In the sentence below, a choice must be made between two parenthetical options to avoid a dangling modifier. Which of the two phrases ('the annual journey of these insects became clear to Dr. Patel.' or 'Dr. Patel finally understood the annual journey of these insects.') is grammatically correct and logically completes the sentence?

Fill in the blanks below

Having studied the migration patterns of monarch butterflies for over a decade,
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Answer

Dr. Patel finally understood the annual journey of these insects.
The introductory modifier 'Having studied the migration patterns...' must modify the subject of the main clause. The correct phrase ('Dr. Patel finally understood...') places the person who did the studying immediately after the comma, creating a logical and grammatically correct sentence.

Step-by-Step Solution

1
Identify the introductory modifying phrase and determine who or what is performing the action.
The introductory participial phrase is 'Having studied the migration patterns of monarch butterflies for over a decade,' which describes the act of studying.
An introductory modifier must logically describe the subject that immediately follows the comma.
2
Evaluate the subjects of the two options to find the one that logically performs the action.
In the first option, the subject is 'the annual journey.' In the second option, the subject is 'Dr. Patel.'
A journey cannot study butterfly migration, but a scientist like Dr. Patel can.
3
Select the grammatically correct option to complete the sentence.
The phrase starting with 'Dr. Patel' prevents a dangling modifier and ensures the sentence is clear and logically structured.
Placing the logical actor directly after the introductory modifier satisfies standard English grammar conventions.

Key Concept

Avoiding dangling modifiers by placing the logical subject immediately after the introductory modifying phrase.
Estimated Time:1m 0s
Question 9Question →

The passage below contains a blank indicating a missing punctuation mark. Fill in the blank with the punctuation mark that correctly completes the sentence, maintaining consistency with the punctuation already used to set off the nonessential clause.

Fill in the blanks below

In 1967, astrophysicist Jocelyn Bell Burnell detected a series of repeating radio signals—initially dubbed 'Little Green Men' as a jokethat turned out to be the first discovered pulsar.
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Answer

An em dash (—) or double hyphen (--) must be used to close the nonessential parenthetical phrase.
The sentence uses an em dash (—) to open the nonessential parenthetical phrase 'initially dubbed "Little Green Men" as a joke'. Under standard punctuation rules tested on the ACT, nonessential phrases set off by dashes must be closed with a matching dash. Therefore, an em dash (—) or its keyboard representation (--) is required to correctly complete the sentence.

Step-by-Step Solution

1
Identify the parenthetical (nonessential) clause in the sentence.
The phrase 'initially dubbed "Little Green Men" as a joke' provides extra, nonessential information about the radio signals.
Nonessential information must be set off from the rest of the sentence by matching punctuation marks on both sides.
2
Examine the punctuation mark that opens the parenthetical clause.
An em dash (—) precedes 'initially'.
This establishes that dashes are being used as the punctuation style for this parenthetical element.
3
Determine the matching punctuation mark needed to close the parenthetical clause.
Another em dash (—) or double hyphen (--) is required before 'that'.
To maintain punctuation consistency, a dash must be paired with another dash; pairing a dash with a comma, semicolon, or parenthesis is incorrect.

Key Concept

Punctuation consistency with parenthetical elements requires using matching marks (dash with dash, comma with comma, parenthesis with parenthesis) to set off nonessential information.
Estimated Time:45s
Question 10Question →

Read the following passage about art history. Which word most precisely and clearly completes the sentence while maintaining a formal, academic tone?

Fill in the blanks below

For centuries, the authorship of the portrait was a subject of intense debate among art historians. Recently, however, researchers used advanced X-ray fluorescence to analyze the paint layers, which the mystery by revealing a hidden signature beneath the top varnish. The discovery confirmed that the painting was indeed a masterpiece from Rembrandt's studio.
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Answer

resolved (or solved)
The verb 'resolved' (or 'solved') is the most precise and idiomatic word to describe bringing a mystery to a conclusion, especially within a formal, academic context.

Step-by-Step Solution

1
Analyze the context of the sentence and the tone of the passage.
The passage describes an academic investigation that ended a long-standing debate using scientific evidence, establishing a formal tone.
Determining the context and register helps eliminate words that are too informal or imprecise.
2
Identify the relationship between the blank and the noun 'mystery'.
The blank requires a verb that collocates precisely with 'mystery' in a formal context.
Choosing a word that is idiomatic and precise is essential for maintaining the clarity and tone of the passage.
3
Select the correct verb that best fits the context.
Verbs like 'resolved', 'solved', 'settled', or 'unraveled' are the most precise and idiomatic terms for bringing a mystery to a definitive end.
These verbs accurately convey that the mystery was concluded through empirical evidence, matching the academic style.

Key Concept

Selecting precise vocabulary that fits the context and register of the passage.
Question 11Question →

The sentence below describes the final steps of preparing a report. What verb form correctly completes the sentence to maintain parallel structure with the other actions in the list?

Fill in the blanks below

Before publishing the report, the editors spent hours verifying the sources, formatting the citations, and the spelling of technical terms.
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Answer

Any present participle (verb ending in -ing) that logically fits the context, such as 'checking', 'proofreading', or 'correcting'.
The correct answer must be a present participle (ending in -ing) because the previous two items in the list ('verifying' and 'formatting') are present participles. Grammatical parallelism requires all items in a coordinate list to share the same part of speech and form.

Step-by-Step Solution

1
Identify the structure of the list in the sentence.
The sentence lists three actions the editors did: 'verifying the sources', 'formatting the citations', and the action in the blank.
Grammatical items in a list must share the same form to maintain parallel structure.
2
Determine the grammatical form of the existing list items.
Both 'verifying' and 'formatting' are present participles (verbs ending in -ing).
This establishes the grammatical pattern that the final list item must follow.
3
Choose a verb that fits the context of 'the spelling of technical terms' and matches the present participle form.
Verbs like 'checking', 'proofreading', or 'correcting' fit both the grammatical pattern and the semantic context.
Using an -ing verb maintains parallelism, whereas other forms like 'checked' or 'to check' would break the pattern.

Key Concept

Parallelism in a list of actions requires all verbs to share the same grammatical form.
Question 12Question →

The sentence below contains a dangling modifier because the introductory participial phrase does not logically modify the subject of the clause that follows:

'Determining that the fossilized tracks belonged to a juvenile theropod, the footprints were carefully cast by the paleontologists in plaster.'

To correct this error, complete the sentence by typing a grammatically correct clause in the blank that begins with the subject 'the paleontologists' and includes the verb 'cast', the adverb 'carefully', and the direct object 'the footprints'.

Fill in the blanks below

Determining that the fossilized tracks belonged to a juvenile theropod, in plaster.
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Answer

The corrected sentence should read: 'Determining that the fossilized tracks belonged to a juvenile theropod, the paleontologists carefully cast the footprints in plaster.'
The correct response resolves the dangling modifier by placing the logical subject—the paleontologists—immediately after the introductory phrase. Since it was the paleontologists who determined the identity of the tracks, they must serve as the subject of the independent clause. Phrasing the clause in the active voice ('the paleontologists carefully cast the footprints') ensures grammatical alignment and clear sentence structure.

Step-by-Step Solution

1
Identify the introductory modifier and its logical subject.
The phrase 'Determining that the fossilized tracks belonged to a juvenile theropod' describes an action that requires a conscious agent capable of making a determination.
Introductory modifiers must logically describe the subject of the main clause that immediately follows.
2
Identify the grammatical error in the original sentence.
The original sentence uses 'the footprints' as the subject of the main clause, which creates a dangling modifier because footprints cannot determine their own origin.
A dangling modifier occurs when the modifier's target is either missing or incorrectly identified in the sentence.
3
Rephrase the clause in the active voice with the correct logical subject.
Change the subject of the main clause to 'the paleontologists' and express the action in the active voice: 'the paleontologists carefully cast the footprints'.
This placement aligns the introductory modifier with the correct subject, ensuring logical coherence and grammatical correctness.

Key Concept

Introductory modifiers must logically modify the subject of the main clause that follows.
Estimated Time:1m 0s
Question 13Question →

Complete the passage by entering the pronoun that correctly agrees with its antecedent under standard written English conventions.

Fill in the blanks below

While each of the newly established research laboratories in the biotechnology corridor boasts state-of-the-art gene-sequencing equipment, neither of the two facilities, despite receiving substantial initial funding from private investors, has yet finalized application for the federal development grant.
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Answer

its
The correct pronoun is 'its'. The subject of the main clause is the singular indefinite pronoun 'neither'. Even though it is followed by the plural prepositional phrase 'of the two facilities' and the parenthetical modifier 'despite receiving substantial initial funding from private investors', the antecedent remains singular. Therefore, it requires the singular possessive pronoun 'its' to maintain correct grammatical agreement.

Step-by-Step Solution

1
Locate the main clause and its grammatical subject.
The subject of the main clause is the indefinite pronoun 'neither'. The plural noun 'facilities' is contained within the modifying prepositional phrase 'of the two facilities' and is not the subject.
Identifying the true subject is critical because the possessive pronoun must agree with this antecedent in number.
2
Determine the grammatical number and person of the subject 'neither'.
Under the rules of standard written English, the indefinite pronoun 'neither' is singular. Because it refers to inanimate facilities, it is third-person and neuter.
Establishing the singular nature of 'neither' dictates that the corresponding pronoun must also be singular.
3
Determine the correct possessive pronoun form.
The singular neuter possessive pronoun 'its' is selected.
The singular possessive 'its' agrees with 'neither'. Using the plural 'their' creates a pronoun-antecedent agreement error.

Key Concept

Pronoun-Antecedent Agreement with Indefinite Pronouns
Question 14Question →

Read the sentence below and fill in the blank with the possessive pronoun that correctly agrees with its antecedent.

Fill in the blanks below

The lead archaeologist and the museum curator carefully unpacked the ancient artifacts to ensure that fragile surfaces remained undamaged.
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Answer

their
The pronoun refers back to the plural antecedent 'artifacts'. Therefore, the plural possessive pronoun 'their' is required to ensure correct pronoun-antecedent agreement.

Step-by-Step Solution

1
Identify the antecedent of the pronoun to be filled in the blank.
The antecedent is the plural noun 'artifacts'.
The pronoun modifies 'fragile surfaces', which belong to the 'artifacts'.
2
Determine the number of the antecedent.
The noun 'artifacts' is plural.
It refers to more than one historical object.
3
Select the correct plural possessive pronoun.
The plural possessive pronoun is 'their'.
Plural antecedents must be paired with plural pronouns to maintain correct pronoun-antecedent agreement.

Key Concept

Pronoun-Antecedent Agreement with Plural Nouns
Question 15Question →

In the sentence below, a pronoun is missing. Which pronoun correctly completes the sentence to ensure proper pronoun-antecedent agreement?

Fill in the blanks below

The advisory council of urban architects presented final master plan for the riverfront redevelopment to the city council last Tuesday.
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Answer

The possessive pronoun 'its' is the correct answer because it agrees in number and gender with the singular, neuter collective noun 'council'.
The correct pronoun is 'its' because the antecedent 'advisory council' is a singular collective noun. A singular collective noun acting as a single unit requires a singular possessive pronoun.

Step-by-Step Solution

1
Identify the antecedent of the missing pronoun.
The antecedent is 'The advisory council'.
The pronoun must refer to the group that created and presented the master plan.
2
Determine the grammatical number (singular or plural) and gender of the antecedent.
The noun 'council' is a singular collective noun. The intervening prepositional phrase 'of urban architects' contains a plural noun, but it does not change the singular status of the main noun 'council'.
In standard formal English, collective nouns that act as a single unit are singular.
3
Choose the pronoun that matches the singular, neuter antecedent.
The singular possessive pronoun 'its' is selected.
To show possession for a singular, non-human antecedent, 'its' must be used.

Key Concept

Pronoun-Antecedent Agreement
Question 16Question →

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

Fill in the blanks below

The committee of urban planners presented comprehensive redevelopment proposal to the city council during Tuesday's public hearing.
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Answer

its
The singular possessive pronoun 'its' correctly agrees with the singular collective noun 'committee,' which functions as a unified singular unit. The intervening prepositional phrase 'of urban planners' contains a plural noun, but it does not change the singular nature of the subject.

Step-by-Step Solution

1
Identify the antecedent of the missing pronoun.
The antecedent is the collective noun 'committee.'
The sentence describes the entity that presented a proposal. The prepositional phrase 'of urban planners' modifies the noun 'committee,' but 'committee' remains the singular subject and head of the noun phrase.
2
Determine the proper number and gender for the pronoun.
The pronoun must be singular, neuter, and possessive.
Collective nouns like 'committee' are singular when the group acts as a single, unified entity. The singular possessive pronoun for a non-human entity is 'its.'

Key Concept

A pronoun must agree in number with its antecedent. Singular collective nouns acting as a unit require singular pronouns, even when followed by prepositional phrases containing plural nouns.
Estimated Time:45s
Question 17Question →

Which pronoun correctly completes the sentence below while maintaining proper pronoun-antecedent agreement?

Fill in the blanks below

Neither the municipal libraries nor the local museum could verify that archival collection contained the rare 18th-century map of the county.
Show answer & explanation

Answer

its
The correct pronoun is 'its' because it is a singular possessive pronoun that agrees with the closer singular antecedent, 'the local museum', following the proximity rule for correlative conjunctions.

Step-by-Step Solution

1
Identify the antecedent of the pronoun.
The subject contains a compound antecedent joined by the correlative conjunction 'neither... nor': 'the municipal libraries' (plural) and 'the local museum' (singular).
Finding the antecedent helps determine the correct agreement.
2
Apply the rule of proximity.
When subjects are joined by 'neither... nor', the pronoun agrees with the closer antecedent. Here, the closer antecedent is the singular noun 'the local museum'.
The proximity rule determines pronoun number for compound subjects joined by 'neither... nor'.
3
Determine the correct pronoun form.
The singular possessive pronoun for the inanimate antecedent 'museum' is 'its'.
A possessive pronoun is required to show ownership of the 'archival collection'.

Key Concept

Pronoun-Antecedent Agreement with Correlative Conjunctions
Question 18Question →

Complete the sentence below to maintain parallel structure by typing the correct form of the verb in parentheses.

Fill in the blanks below

To prepare for the marathon, Marcus planned on running five miles every morning, eating a balanced diet, and (sleep) for eight hours each night.
Show answer & explanation

Answer

sleeping
The correct answer is 'sleeping' because it matches the gerund form (-ing) of the other list elements: 'running' and 'eating'.

Step-by-Step Solution

1
Identify the items in the list to determine the grammatical pattern.
The sentence lists three actions that Marcus planned on doing: 'running five miles every morning,' 'eating a balanced diet,' and a third action involving sleep.
Parallel structure requires that items in a list or series follow the same grammatical form.
2
Analyze the grammatical form of the first two list items.
The first two items, 'running' and 'eating', are gerunds (verb forms ending in -ing).
Establishing the pattern of the existing items dictates the required form for the remaining item.
3
Convert the verb in parentheses to match the established pattern.
The verb 'sleep' must be changed to its gerund form, 'sleeping', to maintain parallel structure with 'running' and 'eating'.
This completes the parallel sequence in a grammatically consistent manner.

Key Concept

Parallel Structure
Question 19Question →

Complete the sentence below by typing the possessive pronoun that correctly agrees with its antecedent under standard written English conventions.

Fill in the blanks below

Each of the international research organizations that monitored the retreat of the glaciers in the Patagonia region was eager to publish independent findings in the annual climatology report.
Show answer & explanation

Answer

its
The correct pronoun is the singular possessive 'its' because it agrees with the singular indefinite pronoun 'Each', which is the true antecedent of the sentence. The plural noun 'organizations' inside the modifying prepositional phrase does not affect the grammatical number of the subject.

Step-by-Step Solution

1
Identify the subject and antecedent of the pronoun in the sentence.
The subject and antecedent is the singular indefinite pronoun 'Each'.
The prepositional phrase 'of the international research organizations' modifies 'Each' but does not change its singular grammatical number.
2
Determine the correct grammatical number and person for the pronoun that must fill the blank.
The pronoun must be singular and third-person to agree with 'Each'.
A pronoun must agree in number (singular/plural) and person with its antecedent.
3
Select the correct possessive pronoun to complete the phrase 'independent findings'.
The singular possessive pronoun is 'its'.
Since the antecedent 'Each' is singular and refers to inanimate organizations, the singular third-person possessive pronoun 'its' is required.

Key Concept

Pronoun-Antecedent Agreement with Indefinite Pronouns
Question 20Question →

Which pronoun should be placed in the blank to ensure correct pronoun-antecedent agreement in the sentence below?

Fill in the blanks below

The astronomers spent months gathering data, but the director of the observatory doubted findings.
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Answer

their
The pronoun 'their' is correct because it is a plural possessive pronoun that correctly agrees in number with the plural noun antecedent 'astronomers'.

Step-by-Step Solution

1
Identify the antecedent that the pronoun in the blank refers to.
The antecedent is 'astronomers'.
A pronoun must agree in number (singular or plural) with the antecedent it replaces.
2
Determine the number of the antecedent and select the corresponding possessive pronoun.
The antecedent 'astronomers' is a plural noun, so the plural possessive pronoun 'their' is required.
Using a singular possessive pronoun would create a pronoun-antecedent agreement error.

Key Concept

Pronoun-Antecedent Agreement
Estimated Time:45s
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