Examkin

All practice questions

5556 questions

All types5,556Multiple choice4,015True / False124Numeric541Matching290Ordering294Fill in the blank292
Question 4281Question →

Though recorded in a single afternoon, jazz enthusiasts still view Miles Davis's masterpiece *Kind of Blue* as a landmark achievement.

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

Show answer & explanation

Answer: Miles Davis's masterpiece *Kind of Blue* is still viewed by jazz enthusiasts as a landmark achievement.

Answer

The corrected sentence must place the album immediately after the introductory modifier as the subject of the clause, forming a grammatically complete and correct sentence: 'Though recorded in a single afternoon, Miles Davis's masterpiece *Kind of Blue* is still viewed by jazz enthusiasts as a landmark achievement.'
The introductory phrase 'Though recorded in a single afternoon' describes an album. To avoid a dangling modifier, the noun immediately following the comma must be the album itself. The option beginning with 'Miles Davis's masterpiece *Kind of Blue*' correctly aligns the modifier with its logical subject in a grammatically complete sentence.

Step-by-Step Solution

1
Identify the introductory modifying phrase and determine what it describes.
The phrase 'Though recorded in a single afternoon' must describe an album, not people.
Introductory phrases must logically modify the noun that immediately follows them.
2
Evaluate the subject of the main clause in the options to find one that aligns with this modifier.
The album 'Miles Davis's masterpiece *Kind of Blue*' must be the subject immediately following the comma.
This placement resolves the dangling modifier.
3
Check the remaining options for other grammatical errors, such as fragments or comma splices.
Eliminate options that introduce fragments or comma splices, leaving the grammatically sound passive-voice correction.
Correct grammar requires both logical modifier placement and proper clause structure.

Key Concept

Introductory modifiers must be placed immediately adjacent to the noun they logically describe to avoid dangling modifier errors.
Question 4282Question →

The school principle, Ms. Lopez, welcomed the new students during the morning assembly.

Which of the following choices is the correct word to use in the underlined portion of the sentence?

Show answer & explanation

Answer: principal

Answer

principal
The correct answer is 'principal'. In this sentence, the context refers to a person who is the head of a school. The noun 'principal' refers to a school administrator, which is the correct spelling and meaning for this context.

Step-by-Step Solution

1
Identify the meaning of the underlined word in the sentence's context.
The sentence refers to Ms. Lopez, who is the leading administrator of a school.
Understanding the context helps determine whether the sentence requires a word meaning 'a head of a school' or 'a fundamental rule'.
2
Compare the definitions of the homophones 'principal' and 'principle'.
'Principal' refers to a person of leading importance or a school head. 'Principle' refers to a fundamental truth, rule, or belief.
Choosing between these homophones requires selecting the spelling that matches the intended meaning.
3
Select the option that correctly provides the singular noun 'principal'.
The correct choice is 'principal'.
This spelling correctly identifies the school administrator in the singular form.

Key Concept

Frequently Confused Words (principal vs. principle)
Question 4283Question →

The design of the new city library is similar with the classical architecture of the historic town hall.

Which choice best replaces the underlined portion of the sentence?

Show answer & explanation

Answer: similar to

Answer

The correct choice is 'similar to' because the adjective 'similar' idiomatically requires the preposition 'to' to establish a comparison between two nouns.
The correct choice uses the preposition 'to' because 'similar to' is the established idiomatic expression used to describe a resemblance between two entities.

Step-by-Step Solution

1
Identify the underlined prepositional relationship in the sentence context.
The sentence compares the design of a library to the architecture of a town hall using the adjective 'similar' and the preposition 'with'.
This allows you to determine whether the adjective-preposition pair conforms to standard English conventions.
2
Determine the correct idiomatic preposition that pairs with 'similar'.
In standard written English, the adjective 'similar' always pairs with the preposition 'to' to indicate resemblance.
Prepositions must follow established idiomatic conventions rather than literal translation or colloquial patterns.
3
Evaluate the choices to locate the correct phrasing.
The choice containing 'similar to' is the only option that uses the correct preposition. The options containing 'similar with', 'similar than', and 'similar as' are unidiomatic.
Replacing the incorrect preposition 'with' with 'to' corrects the grammatical error.

Key Concept

Idiomatic prepositions are fixed combinations of words (verbs, adjectives, or nouns paired with specific prepositions) that must be used together to be grammatically correct. The adjective 'similar' must always be paired with the preposition 'to'.
Question 4284Question →

Read the passage below and select the phrase that best replaces the underlined portion to correct the sentence structure and modifier placement. Which of the phrases from the options list correctly completes the sentence to avoid a modifier error?

Options to choose from:
- NO CHANGE (which leaves 'a hidden cache of gold coins was discovered by the archaeologists')
- the archaeologists discovered a hidden cache of gold coins
- the archaeologists discovering a hidden cache of gold coins
- the archaeologists discovered a hidden cache of gold coins, they were excited

Fill in the blanks below

While excavating the subterranean chambers of the ancient Roman villa, a hidden cache of gold coins was discovered by the archaeologists.

Corrected phrase:
Show answer & explanation

Answer

the archaeologists discovered a hidden cache of gold coins
The correct answer resolves the dangling modifier by placing the logical subject, 'the archaeologists,' immediately after the introductory clause. This ensures that the introductory phrase 'While excavating the subterranean chambers of the ancient Roman villa' correctly modifies the entity performing the action.

Step-by-Step Solution

1
Identify the introductory modifying phrase in the sentence.
The introductory phrase is 'While excavating the subterranean chambers of the ancient Roman villa,' which is a participial modifier.
This phrase describes an action that must be performed by a logical subject immediately following the comma.
2
Determine the logical subject of the action in the modifier.
The entity doing the excavating must be 'the archaeologists.'
An inanimate object like 'a hidden cache of gold coins' cannot excavate a villa.
3
Select the option that places the logical subject immediately after the comma and forms a complete, grammatically correct sentence.
The phrase 'the archaeologists discovered a hidden cache of gold coins' provides the correct subject and a complete main clause.
This eliminates the dangling modifier without creating a fragment or a comma splice.

Key Concept

Misplaced and Dangling Modifiers
Estimated Time:1m 0s
Question 4285Question →

In 1935, architect Frank Lloyd Wright began designing Fallingwater, a house built directly over a waterfall in rural Pennsylvania. While Wright wanted the waterfall to be a central part of the residents' daily lives, the owner, Edgar Kaufmann, initially expected the house to face the cascades. This led to a series of intense discussions about the integration of nature and architecture.

Which option best maintains pronoun clarity and reference in the underlined portion of the passage?

Show answer & explanation

Answer: This disagreement

Answer

The option stating 'This disagreement' is correct because it replaces the vague pronoun with a specific noun phrase that clearly identifies the subject of the sentence.
The choice 'This disagreement' is correct because it replaces the vague pronoun 'This' with a specific noun phrase, clarifying exactly what led to the discussions and establishing a clear subject for the sentence.

Step-by-Step Solution

1
Identify the underlined pronoun and check for a clear, specific noun antecedent in the preceding sentence.
The pronoun 'This' refers vaguely to the entire situation (Wright wanting the waterfall to be central and Kaufmann wanting the house to face it) rather than a specific noun.
ACT grammar rules require pronouns to have clear, unambiguous noun antecedents.
2
Evaluate the choices to find an option that provides a clear noun or noun phrase to resolve the vague reference.
The phrase 'This disagreement' clearly and precisely identifies the situation, resolving the ambiguity.
Adding a specific noun after 'this' clarifies the subject and corrects the vague pronoun reference error.

Key Concept

Pronoun Clarity and Reference
Question 4286Question →

Fill in the blanks in the sentence below with the correct words from the frequently confused pair 'principal' and 'principle' to ensure the sentence is grammatically correct and contextually appropriate.

Fill in the blanks below

As the investigator of the deep-sea research expedition, Dr. Vance adhered to the strict of ecological preservation, refusing to disturb the delicate hydrothermal vent systems.
Show answer & explanation

Answer

The first blank should be filled with 'principal' (meaning chief or primary), and the second blank should be filled with 'principle' (meaning a fundamental rule or tenet).
In the given context, 'principal' functions as an adjective meaning 'most important, consequential, or influential' (modifying 'investigator'). Meanwhile, 'principle' functions as a noun meaning 'a basic truth, law, or assumption' (referring to the rule of ecological preservation).

Step-by-Step Solution

1
Analyze the context of the first blank: 'As the {{blank_1}} investigator...'
The word modifies 'investigator' and must mean 'first in rank, chief, or primary'. The correct word for this meaning is 'principal'.
Identify the syntactic role and meaning needed for the first modifier.
2
Analyze the context of the second blank: 'adhered to the strict {{blank_2}} of ecological preservation...'
The word functions as a noun meaning 'a fundamental truth, law, or rule of conduct'. The correct word for this meaning is 'principle'.
Identify the syntactic role and meaning needed for the noun following the adjective 'strict'.

Key Concept

Frequently Confused Words: Principal vs. Principle
Question 4287Question →

Read the passage and answer the question that follows.

Deep-sea sediment cores retrieved from the Arctic Ocean contain microscopic fossils of marine organisms known as foraminifera. The chemical composition of these fossils, which accumulated on the ocean floor over millions of years, help scientists reconstruct past global temperatures. By analyzing the oxygen isotopes within the shells, researchers can determine the extent of prehistoric ice sheets.

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

Show answer & explanation

Answer: helps

Answer

The singular present-tense verb 'helps' is correct because it agrees with the singular subject 'composition'.
The singular present-tense verb 'helps' is correct because it matches the singular subject 'composition'. The plural nouns 'fossils' and 'years' are parts of modifying prepositional and relative clauses and do not affect the grammatical number of the subject.

Step-by-Step Solution

1
Identify the subject of the clause containing the underlined verb.
The subject is 'composition', which is a singular noun.
The verb must agree in number (singular vs. plural) with its true grammatical subject, not with the nouns inside intervening phrases.
2
Identify and ignore intervening phrases and clauses that separate the subject from the verb.
The prepositional phrase 'of these fossils' and the relative clause 'which accumulated on the ocean floor over millions of years' both contain plural nouns ('fossils', 'years'), but they do not change the singular nature of the subject 'composition'.
Intervening modifier phrases do not affect subject-verb agreement.
3
Determine the correct verb form and tense based on the subject and the surrounding context.
A singular, present-tense verb ('helps') is required to agree with 'composition' and match the present-tense timeline established by 'contain' and 'can' in the surrounding sentences.
Using a plural verb or shifting to the past tense would violate rules of agreement and tense consistency.

Key Concept

Subject-Verb Agreement with Intervening Phrases
Estimated Time:1m 0s
Question 4288Question →

Art conservators have recently turned to particle accelerators to analyze fragile paintings without damaging them. By bombarding a canvas with high-energy X-rays, researchers can map the distribution of chemical elements in the pigment layers, consequently, this process reveals hidden drawings and structural changes made by the original artist. This non-invasive technology allows museums to study centuries-old masterpieces with unprecedented detail.

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

Show answer & explanation

Answer: layers; consequently, this process reveals

Answer

layers; consequently, this process reveals
The correct answer is the option that reads 'layers; consequently, this process reveals'. This choice correctly joins the two independent clauses using a semicolon before the conjunctive adverb 'consequently' and a comma after it, which is the standard punctuation rule for joining independent clauses with transitional adverbs.

Step-by-Step Solution

1
Analyze the structure of the clauses surrounding the underlined portion.
The clause before the underlined portion ('By bombarding... pigment layers') is independent, and the clause after ('this process reveals... original artist') is also independent.
Identifying clause types determines what punctuation and conjunctions are grammatically required to join them.
2
Evaluate the grammatical legality of the transition word and punctuation.
The word 'consequently' is a conjunctive adverb. Joining two independent clauses with only a comma and a conjunctive adverb is a comma splice, so a semicolon or period is required.
Conjunctive adverbs cannot join independent clauses without proper strong punctuation (a semicolon or period).
3
Verify that the chosen punctuation does not create fragments.
Using a semicolon with a complete independent clause ('this process reveals...') is correct, whereas introducing a participle like 'revealing' or a subordinating conjunction like 'Because' creates a fragment.
The corrected sentence must maintain two complete, grammatically sound clauses.

Key Concept

Joining Independent Clauses with Conjunctive Adverbs
Question 4289Question →

To study the properties of electrical conductors, a researcher measured the electrical resistance, RR (in ohms, Ω\Omega), of four copper wires. The wires all have the same length but differ in their cross-sectional area, AA (in square millimeters, mm2\text{mm}^2). The measurements are presented in the table below:

WireCross-sectional area, AA (mm2\text{mm}^2)Resistance, RR (Ω\Omega)
10.503.44
21.001.72
32.000.86
44.000.43

Based on the table, if a fifth wire of the same length and material has a cross-sectional area of 8.00 mm28.00\text{ mm}^2, what is its predicted resistance?

Show answer & explanation

Answer: 0.215 Ω0.215\ \Omega

Answer

0.215 Ω0.215\ \Omega
The correct answer is 0.215 Ω0.215\ \Omega. The data shows that the electrical resistance (RR) is inversely proportional to the cross-sectional area (AA) of the wire, because their product remains constant (A×R=1.72A \times R = 1.72). Therefore, doubling the cross-sectional area from 4.00 mm24.00\text{ mm}^2 to 8.00 mm28.00\text{ mm}^2 requires halving the resistance from 0.43 Ω0.43\ \Omega to 0.215 Ω0.215\ \Omega.

Step-by-Step Solution

1
Determine the mathematical relationship between cross-sectional area (AA) and resistance (RR) from the table.
The product of AA and RR is constant for all trials (0.50×3.44=1.720.50 \times 3.44 = 1.72, 1.00×1.72=1.721.00 \times 1.72 = 1.72, 2.00×0.86=1.722.00 \times 0.86 = 1.72, and 4.00×0.43=1.724.00 \times 0.43 = 1.72). This demonstrates that RR is inversely proportional to AA, with the relationship R=1.72/AR = 1.72 / A.
Identifying whether the relationship is direct or inverse allows us to correctly scale the variables.
2
Calculate the predicted resistance (RR) for a wire with a cross-sectional area of 8.00 mm28.00\text{ mm}^2.
R=1.72/8.00=0.215 ΩR = 1.72 / 8.00 = 0.215\ \Omega. Alternatively, since the area doubles from 4.00 mm24.00\text{ mm}^2 to 8.00 mm28.00\text{ mm}^2, the resistance must be halved: 0.43 Ω/2=0.215 Ω0.43\ \Omega / 2 = 0.215\ \Omega.
Applying the constant of proportionality or the scaling factor determines the final value.

Key Concept

Direct and Inverse Proportionality
Question 4290Question →

Before beginning the subterranean mapping project, the lead seismologist reminded the field technicians and they that its essential to calibrate the sensors before the simulation begins.

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

Show answer & explanation

Answer: them that it's essential to calibrate the sensors

Answer

The correct answer is the option that uses the objective pronoun 'them' and the contraction 'it's'.
The correct choice uses the objective pronoun 'them' because it serves as the object of the verb 'reminded'. It also uses the contraction 'it's' (meaning 'it is') to properly introduce the adjective 'essential'.

Step-by-Step Solution

1
Determine the correct case for the pronoun in the compound object.
The pronoun follows the verb 'reminded' and is part of a compound direct object ('reminded the field technicians and...'). Therefore, it must be in the objective case ('them' rather than 'they').
Objects of verbs must always be in the objective case.
2
Determine the correct word choice between 'its' and 'it's'.
The sentence requires the contraction 'it is' ('it's') because it is followed by the adjective 'essential'. Using 'its' would be incorrect because 'its' is a possessive pronoun.
Contractions and possessive pronouns are homophones but have distinct grammatical functions.

Key Concept

Pronoun Case and Person
Estimated Time:1m 0s
Question 4291Question →

The following sentence compares the temperatures of two planets. Which word correctly completes the comparison?

Fill in the blanks below

Astronomers have observed that Venus is much hotter Mercury, even though Mercury is closer to the Sun.
Show answer & explanation

Answer

than
The sentence compares the temperature of Venus to Mercury. The conjunction 'than' is used to introduce the second part of a comparison.

Step-by-Step Solution

1
Determine if the sentence requires a word indicating comparison or time/sequence.
The sentence compares the temperature of Venus to that of Mercury ('much hotter').
Identifying the comparative context helps distinguish between the frequently confused words 'than' and 'then'.
2
Apply the correct word choice rules.
Select 'than', which is the conjunction used to introduce the second element in a comparison.
'Than' is grammatically correct for comparisons, whereas 'then' is used to denote time or sequence.

Key Concept

Frequently Confused Words: Than vs. Then
Estimated Time:45s
Question 4292Question →

Complete the sentence by filling in the blanks. Use the comparative form of the adjective 'extensive' to show a greater degree in the first blank, and the appropriate singular pronoun in the second blank to maintain a logical comparison.

Fill in the blanks below

Although the local museum boasts a diverse array of artifacts, its collection of ancient Roman coins is than of the national treasury.
Show answer & explanation

Answer

Although the local museum boasts a diverse array of artifacts, its collection of ancient Roman coins is more extensive than that of the national treasury.
The correct completion uses 'more extensive' to properly compare the two collections using the comparative degree of a multi-syllable adjective, and 'that' as a singular pronoun pointing back to 'collection' to make the comparison logical.

Step-by-Step Solution

1
Identify the two entities being compared.
The local museum's 'collection' is being compared to the 'national treasury'.
To ensure grammatical agreement and logical parity, we must verify what is being compared.
2
Formulate the correct comparative form of the adjective.
Since we are comparing exactly two collections, the comparative form 'more extensive' is required rather than the superlative 'most extensive'.
Comparative forms are used when comparing two entities, whereas superlatives are reserved for three or more.
3
Correct the illogical comparison structure.
Comparing a 'collection' directly to a 'treasury' (an institution) is illogical. Inserting the singular pronoun 'that' creates the parallel structure 'collection ... than that [collection] of the national treasury'.
Comparisons must compare like things (collection to collection, not collection to institution).

Key Concept

Logical comparison and comparative adjective forms. Comparisons must compare comparable things, and the comparative form must be used when exactly two things are being compared.
Question 4293Question →

The success of the community garden project depends of the dedication of its volunteers, who plant and harvest the crops each season. Which of the following choices is the best replacement for the underlined portion?

Show answer & explanation

Answer: depends on

Answer

depends on
The correct choice is 'depends on'. In standard English, the verb 'depend' is idiomatically followed by the preposition 'on' when expressing reliance. Therefore, this option makes the sentence idiomatically correct.

Step-by-Step Solution

1
Identify the verb that is paired with the preposition in the underlined phrase.
The verb is 'depend' ('depends').
We need to determine the correct preposition that idiomatically pairs with this specific verb.
2
Recall or determine the standard English idiom for this verb-preposition pair.
In standard English, the verb 'depend' is paired with the preposition 'on' (or sometimes 'upon') to indicate reliance.
Preposition usage is idiomatic, meaning it follows established language patterns rather than strict grammatical rules.
3
Select the option that matches this idiomatic combination.
The correct phrase is 'depends on'.
This establishes grammatical and idiomatic correctness in the sentence.

Key Concept

Idiomatic prepositions require pairing specific verbs, adjectives, or nouns with their standard prepositions, such as 'depend on'.
Question 4294Question →

Deep below the ocean's surface, hydrothermal vents spew mineral-rich water heated by magma beneath the Earth's crust. Although scientists initially assumed that all life on Earth relied on solar energy, the discovery of these vents proved that ecosystems can thrive in absolute darkness. In these unique environments, specialized bacteria oxidize toxic hydrogen sulfide to produce organic carbon. This chemical conversion process, which bypasses photosynthesis entirely, sustained a diverse web of organisms, supports the surrounding food chain, and feeds specialized deep-sea creatures.

Which choice best maintains a consistent tense and grammatically correct structure throughout the passage?

Show answer & explanation

Answer: sustains

Answer

sustains
The correct answer is the singular present-tense verb 'sustains.' This form matches the present-tense timeline of the paragraph (established by verbs like 'spew,' 'oxidize,' and 'feeds') and maintains parallel structure with 'supports' and 'feeds' in the list of verbs. It also agrees with the singular subject 'process.'

Step-by-Step Solution

1
Analyze the context and surrounding verbs to establish the time frame of the passage.
The passage describes the general, ongoing biological processes of hydrothermal vent ecosystems using present-tense verbs such as 'spew,' 'oxidize,' and 'feeds.'
Establishing the narrative tense helps determine whether a past or present tense verb is appropriate for the underlined portion.
2
Identify the grammatical structure of the sentence containing the underlined verb.
The sentence features a singular subject ('This chemical conversion process') followed by a list of three parallel verbs in a compound predicate: the underlined verb, 'supports,' and 'feeds.'
Recognizing the parallel list and the subject-verb relationship allows you to match the correct verb form for both tense consistency and agreement.
3
Select the verb form that matches the tense of the list and the singular subject.
The verb must be present tense and singular to match 'process' and run parallel to 'supports' and 'feeds.' The correct form is 'sustains.'
Only the singular present-tense verb satisfies both subject-verb agreement and tense parallelism requirements.

Key Concept

Verb Tense and Consistency
Estimated Time:1m 0s
Question 4295Question →

To transition the research facility to renewable energy, the team decided to upgrade their power grid. Designed to track the sun's movement more efficient than any system, the engineers built the solar array to maximize energy production.

Which of the following choices best replaces the underlined portion of the sentence?

Show answer & explanation

Answer: more efficiently than any other system, the solar array was built

Answer

The correct answer is the option that reads 'more efficiently than any other system, the solar array was built'.
The correct option correctly uses the adverb 'efficiently' to modify the verb 'track'. It also places 'the solar array' immediately after the introductory modifying phrase 'Designed to track the sun's movement...', which resolves the dangling modifier. Finally, it uses 'than' for the comparison and 'any other system' to make the comparison logical.

Step-by-Step Solution

1
Analyze the introductory modifier and identify the logical subject of the main clause.
The phrase 'Designed to track the sun's movement...' describes the solar array, not the engineers. Therefore, the main clause must begin with 'the solar array' to avoid a dangling modifier.
Introductory modifying phrases must be placed next to the noun they logically describe.
2
Determine whether an adjective or an adverb is needed to modify the action of tracking.
The verb 'track' must be modified by the adverb 'efficiently' rather than the adjective 'efficient'.
Adverbs modify verbs, whereas adjectives modify nouns.
3
Evaluate the comparison for grammatical and logical correctness.
The conjunction 'than' must be used instead of 'then' to express a comparison, and the phrase 'any other system' must be used instead of 'any system' to keep the comparison logical.
'Than' is used for comparisons, and 'any other' ensures that the solar array is not compared to itself.

Key Concept

Adjective and Adverb Usage, Dangling Modifiers, and Logical Comparisons
Estimated Time:1m 0s
Question 4296Question →

In their analysis of the nineteenth-century map, the museum curator and him argued that it's scale had been miscalculated by the original cartographer.

Which choice best replaces the underlined portion of the sentence?

Show answer & explanation

Answer: he argued that its

Answer

The correct choice is the option that uses the subjective pronoun 'he' and the possessive pronoun 'its'.
The correct option correctly uses the subjective pronoun 'he' because it serves as a compound subject performing the action of the verb 'argued'. Additionally, it correctly uses the possessive pronoun 'its' to show that the scale belongs to the map.

Step-by-Step Solution

1
Determine the correct case for the pronoun in the compound phrase 'the museum curator and...'.
The pronoun acts as part of the compound subject performing the action 'argued'. Therefore, the subjective pronoun 'he' is required instead of the objective pronoun 'him'.
Subject pronouns must be used when the pronoun is the subject of a verb.
2
Determine the correct word to show possession for the noun 'scale'.
The sentence refers to the scale belonging to the map, which requires the possessive pronoun 'its'. The contraction 'it's' (meaning 'it is' or 'it has') is incorrect in this context.
Possessive pronouns do not use apostrophes.

Key Concept

Pronoun Case and Homophones in Compound Structures
Estimated Time:1m 0s
Question 4297Question →

Many students are interested at learning more about marine biology after visiting the local aquarium.

Which choice best replaces the underlined portion of the sentence?

Show answer & explanation

Answer: interested in

Answer

interested in
The correct answer is the option containing 'interested in'. In English, the adjective 'interested' is idiomatically paired with the preposition 'in' to describe a feeling of curiosity or concern about something. Therefore, the phrase 'interested in learning' is grammatically and idiomatically correct.

Step-by-Step Solution

1
Identify the underlined phrase and determine the grammatical function of the key word.
The word 'interested' acts as an adjective in this context.
Identifying the part of speech helps in determining which preposition is idiomatically correct.
2
Evaluate the idiomatic combination of 'interested' with the prepositions in the choices.
The adjective 'interested' must be paired with the preposition 'in' to form a standard English idiom.
Other prepositions like 'at', 'of', and 'with' violate standard English idiomatic usage.

Key Concept

Idiomatic Prepositions
Question 4298Question →

The restoration of medieval stained glass windows requires a delicate balance of art and chemistry. The accumulation of dirt, pollutants, and fungal growth on the glass surface have threatened to obscure the vibrant colors permanently. Conservators must carefully clean the panels before applying a protective microcrystalline wax coating.

Which option correctly completes the underlined portion of the passage?

Show answer & explanation

Answer: has threatened

Answer

has threatened
The singular verb 'has threatened' is correct because it agrees in number with the singular subject 'accumulation'. The plural nouns 'dirt', 'pollutants', and 'growth' are objects of the preposition 'of' and do not determine the number of the verb. This choice also maintains present-tense consistency with the surrounding text.

Step-by-Step Solution

1
Identify the grammatical subject of the sentence containing the underlined verb.
The subject is the singular noun 'accumulation'. The plural nouns 'dirt', 'pollutants', and 'growth' are part of the intervening prepositional phrase 'of dirt, pollutants, and fungal growth' and do not affect the verb's agreement.
The subject of a sentence is never found within a prepositional phrase.
2
Select the verb form that agrees with the singular subject and matches the tense of the passage.
The singular present perfect verb 'has threatened' agrees with the singular subject 'accumulation' and maintains consistency with the present tense of the rest of the passage ('requires', 'must').
A singular subject requires a singular verb, and tenses should remain consistent across sentences unless there is a clear temporal shift.

Key Concept

Subject-Verb Agreement with Intervening Phrases
Question 4299Question →

The following sentence contains a blank. Complete the sentence by writing the correct present-tense form of the verb 'to represent' in the blank, ensuring proper subject-verb agreement.

Fill in the blanks below

The discovery of ancient silk scrolls, which were buried in the dry climate of the desert tomb for over two millennia, a major breakthrough for historians studying the Han dynasty.
Show answer & explanation

Answer

represents
The singular verb 'represents' correctly agrees with the singular subject 'discovery'. All intervening words between the subject and the verb are parts of modifying prepositional phrases and relative clauses, which do not change the grammatical number of the subject.

Step-by-Step Solution

1
Identify the main subject of the clause.
The subject is 'discovery'.
Intervening modifiers like the prepositional phrase 'of ancient silk scrolls' and the relative clause 'which were buried in the dry climate of the desert tomb for over two millennia' do not affect the verb's agreement.
2
Determine the grammatical number of the subject.
The noun 'discovery' is singular.
It refers to a single act of finding the scrolls.
3
Determine the correct present-tense form of the verb 'to represent' to match the singular subject.
The singular third-person present-tense form is 'represents'.
Singular subjects require singular verbs ending in '-s' in the present tense.

Key Concept

Subject-Verb Agreement
Question 4300Question →

Read the sentence below and determine which choice represents the correct word to use in the underlined portion:

The novelist’s subtle illusion to classical mythology added a layer of depth that only scholarly readers would appreciate.

Which choice is the correct word to use in the sentence?

Show answer & explanation

Answer: allusion

Answer

The correct choice is 'allusion' because it is a noun meaning an indirect reference, which fits the context of referring to classical mythology.
The correct answer is 'allusion' because it is a noun that means an indirect or passing reference. In this sentence, the novelist is making an indirect reference to classical mythology, making 'allusion' the semantically and grammatically appropriate choice.

Step-by-Step Solution

1
Analyze the context of the sentence to identify the intended meaning of the underlined word.
The sentence refers to a novelist referencing classical mythology. Thus, the correct word must mean 'an indirect reference.'
This establishes the semantic requirement for the sentence.
2
Compare the definitions and parts of speech of the options to find the correct fit.
'allusion' is a noun that means an indirect reference, which matches both the meaning and grammar of the sentence. Other options are either incorrect parts of speech or have unrelated meanings.
This eliminates distractors and selects the accurate word choice.

Key Concept

Frequently Confused Words
PreviousPage 215 / 278Next
All practice questions — ACT | Examkin