TOEFL Exam Questions Quiz: Test Your English Skills

"Has been regulated" is the correct present perfect passive form because the sentence describes an ongoing regulatory action that began at a specific point in the past — the early 2000s — and continues to the present. "Regulated" is a simple past active form that does not convey ongoing regulation. "Has regulated" is active voice, which incorrectly implies the salmon populations are doing the regulating. "Is regulated" is simple present passive, which does not capture the duration from a past starting point.

"Use" is incorrect and should be "used." The sentence uses a passive construction — "is used" — which requires the past participle form "used." The base verb form "use" cannot complete a passive structure. "Long-distance transport" correctly functions as the object of the preposition "during." "Often applied" correctly uses the past participle in the second passive construction. "Temperature-sensitive" correctly functions as a compound adjective modifying "pharmaceutical shipments."

"That" is incorrect and should be removed entirely, or the phrase should read "makes for a remarkable range." The verb "make" in the sense of producing or resulting in something uses "make for" as the correct phrasal structure, not "makes that." "From tropical coastlines" correctly introduces the starting point of the geographic range. "Alpine terrain" correctly functions as the second element in the paired prepositional phrase. "A remarkable range" correctly functions as the object of the phrasal verb.

"Raises" correctly agrees with the singular subject "the manufacturing division's output" in the simple present tense. "Rise" is an intransitive verb meaning to go up and cannot take a direct object such as "questions." "Raised anew" is simple past, which does not align with a present-tense observation about current output. "Have raised" uses a plural auxiliary that does not agree with the singular subject.

"Promote" is incorrect and should be "promoted." The sentence requires a past participle to form a reduced passive relative clause — "promoted through extensive clinical partnerships" — modifying "treatments." The base verb form "promote" cannot serve this grammatical function. "For decades" correctly functions as a prepositional time phrase. "Developing" correctly functions as a gerund following the preposition "for." "Worldwide" correctly functions as an adverb modifying the participial phrase.

"Help" is incorrect and should be "helped." The sentence uses the present perfect construction "has helped," which requires the past participle form "helped." Using the base form "help" after the auxiliary "has" is grammatically incorrect. "Has" correctly functions as the present perfect auxiliary. "And improve" correctly uses the base form in a parallel infinitive structure following "reduce." "Overall productivity" correctly functions as the object of the verb phrase.

"According to" is the correct fixed phrase used to attribute information to a specific source. "As stated from" is non-standard; the correct form would be "as stated by." "In accordance to" is incorrect; the standard phrase is "in accordance with," which expresses conformity rather than attribution. "Based from" is grammatically incorrect; the correct form is "based on," which also does not serve as an attribution phrase.

"And more" correctly and concisely indicates that the list of discounted procedures extends beyond those explicitly named, functioning as a standard list extender. "In procedures" is a prepositional phrase that does not logically extend a list of items. "And more procedures" is redundant because "procedures" has already been established as the topic and does not need to be restated. "With others" introduces an ambiguous reference that does not clearly extend the list of discounted offerings.

"Can" correctly expresses possibility, indicating that these factors have the potential to cause negative consequences without asserting that they always do. "Must" implies obligation or near-certainty, which overstates the claim. "Shall" is used for formal intentions or future commitments, not general possibilities. "Ought" requires "to" to form "ought to" and cannot stand alone before the base verb in standard usage.

"On Monday" is the correct prepositional phrase for referring to a specific day of the week. "In Monday" is grammatically incorrect as "in" is used for months, years, and longer time periods, not specific days. "At Monday" is non-standard and not used in English to reference days. "By Monday" indicates a deadline rather than a point in time when an event occurred.

"Depleting" is the most precise term because it specifically describes the gradual using up of a finite resource — in this case, clean groundwater — which aligns with the environmental concern implied in the sentence. "Reducing" is a general term that does not convey the severity of resource loss. "Exhausting" implies complete elimination, which is stronger than what the sentence suggests. "Limiting" means restricting access rather than consuming the resource itself.

"Managers" correctly functions as a straightforward plural subject for the main clause verb "are." "Supervisors who" introduces a relative clause that leaves the sentence without a complete main clause predicate. "When supervisors" introduces a time clause, making the first part a subordinate clause with no main clause to complete the sentence. "Those managers who" also introduces a relative clause construction that requires a separate main clause to follow.

"Raise" is incorrect and should be "raises." The subject "the committee's decision" is singular and requires the third-person singular verb form "raises" in the simple present tense. "To restructure" correctly functions as an infinitive phrase modifying "decision." "Whether" correctly introduces the embedded indirect question. "Frontline staff" correctly functions as the object of the verb "affect."

"Which integrates" correctly introduces a non-defining relative clause providing additional information about the platform. "That it integrates" introduces a redundant subject pronoun "it" alongside the relative pronoun "that," creating a double-subject error. "Integrated" is a past participle that would need "having" to function as a participial phrase — "having integrated" — and does not correctly attach as a clause. "By integrating" introduces a prepositional phrase of means rather than a relative clause describing the platform's features.

"To ensure that" correctly follows the adjective "essential" in the structure "it is essential to ensure that," using an infinitive to introduce the required condition. "Ensuring" is a gerund that does not complete the "it is essential" structure as naturally as the infinitive form. "For ensuring that" is non-standard after "essential" in formal written English. "That ensuring" attempts to combine a conjunction and a gerund, producing a grammatically incorrect clause opener.

"Have made" is correct because the subject "the combined effect of rising operational costs and declining customer retention" is grammatically plural in meaning, referring to two compounding factors, and the present perfect "have made" correctly describes an ongoing consequence. "Make" is the simple present and does not convey the accumulated impact over time. "Has make" is grammatically incorrect as "make" is not the past participle form. "Is making" is present continuous, which does not convey the same sense of established consequence.

"With" should be replaced with "using" or the phrase restructured to read "was built using funding." In this context, "with funding from" is actually a common construction — however, the cleaner error is that the sentence requires "using" to properly connect the building action to its funding source. Among the four options, "with" produces the most grammatically awkward relationship between the passive verb and the funding phrase.

"And that" is redundant and creates an awkward compound clause where a simpler construction would be clearer. The sentence reads more naturally as "it begins to overheat, triggering an automatic shutdown protocol" without "and that." "Has operated" correctly uses the present perfect in a time clause. "Continuously" correctly functions as an adverb modifying "operated." "To overheat" correctly functions as the infinitive complement of "begins."

"Are" is correct because the subject complement "employee compensation and benefits" is plural, and the linking verb must agree with the complement in this inverted structure. "Is being" uses the present continuous, which implies a temporary state rather than a standard budgetary fact. "Were" is past tense, which does not apply to a current budget. "Has been" is present perfect, which implies a change over time rather than stating a present fact.

"Made up" is the most natural and idiomatic phrasal verb for describing the proportional composition of a group — in this case, single-person households forming a third of all residential units. "Constituted" is correct in meaning but more formal and less natural in this statistical context. "Represented" implies acting on behalf of something rather than forming a numerical proportion. "Comprised of" is grammatically incorrect; "comprise" is used without "of" — the correct form is "comprised" or "was comprised of" in passive construction.

"Breed" is the most contextually precise verb because the sentence specifies a seasonal activity linked to food abundance in summer, which aligns with breeding behavior. "Are resident" implies permanent settlement rather than seasonal migration. "Reside" suggests a fixed dwelling rather than a temporary seasonal presence. "Inhabit" implies occupying a space as a habitat, which does not capture the seasonal migratory pattern described.