TOEFL English Exercise Quiz: Practice For The Exam

"Lengthily" is incorrect and should be "long." The sentence uses an "as...as" comparative structure, which requires an adjective — not an adverb — to describe the appearance of the arms. "Lengthily" is an adverb that modifies verbs, not nouns or adjective constructions. "Chimpanzee's" correctly functions as a possessive noun modifier. "Appear" correctly functions as the linking verb. "Unusually wide" correctly functions as an adverb-adjective phrase modifying "reach."

"Are accumulate" is incorrect and should be "are accumulated" or simply "accumulate." If passive voice is intended, the past participle "accumulated" is required — "are accumulate" incorrectly uses the base verb form. If active voice is intended, "accumulate" alone without "are" is correct. "Results from" correctly functions as the main verb phrase with its preposition. "In which" correctly introduces the relative clause. "High concentration" correctly functions as a noun phrase within the prepositional phrase.

"Base" is incorrect and should be "based." The sentence uses the passive construction "will be based on," which requires the past participle "based." "Base" is the uninflected verb form and cannot complete the passive structure. "Infrastructure proposal" correctly functions as the subject. "Recent" is noted as an adjective, though "conducted" would more precisely need "recently" — "base" remains the most clearly incorrect form among the options. "Submitted" correctly functions as a past participle in a reduced relative clause modifying "feasibility study."

"Agencies district" is incorrect and should be "agency districts" or "regional districts." The noun modifier construction requires the singular form "agency" before "districts," and the noun "districts" must be plural to match "eight." "Federal regulatory" correctly functions as a compound adjective modifying "framework." "Is divided" correctly functions as the passive verb phrase. "Oversight responsibilities" correctly functions as the object noun phrase.

"Or" is incorrect and should be "and." The correlative conjunction "both...and" is a fixed pairing used to include two elements together. "Both...or" is not a standard English construction. "Research expedition" correctly functions as the subject of the sentence. "Covered" correctly functions as the simple past main verb. "Northern tundra" correctly functions as the first element in the paired noun phrase.

"Has launched" is incorrect and should be "was launched." The sentence describes a completed historical event with a specific date — April 1960 — which requires the simple past tense, not the present perfect. The present perfect cannot be used with a definite past time expression. "First" correctly functions as an ordinal adjective modifying "weather satellite." "Into orbit" correctly functions as a prepositional phrase of direction. "Meteorological" correctly functions as an adjective modifying "observation."

"We is planning" is grammatically incorrect because the plural subject "we" requires the plural verb form "are," not the singular "is." The correct form is "We are planning." Option B correctly uses the present perfect "has worked" with the singular subject "she." Option C correctly uses the simple past passive "were notified" with the plural subject "they." Option D correctly uses the simple present "attends" with the singular subject "he."

"Few" is incorrect and should be "fewer." When making a comparison using "than," the comparative form "fewer" is required for countable nouns such as "amino acids." "Few" is a base quantifier used without a comparison. "Legume-based" correctly functions as a compound adjective modifying "proteins." "Tend to" correctly functions as a semi-modal verb phrase. "Derived from" correctly functions as a participial phrase modifying the pronoun "those."

"Their" is incorrect and should be "its." "The Amazon River" is a singular noun and requires the singular possessive pronoun "its." "Their" is a plural possessive pronoun that does not agree with a singular subject. "Reaches" correctly agrees with the singular subject "The Amazon River." "Maximum flow" correctly functions as a noun phrase serving as the object. "During" correctly functions as a preposition introducing the time phrase.

"Reliable" is incorrect and should be "reliably." The sentence requires an adverb to modify the infinitive "communicate," describing the manner in which communication must occur. An adjective cannot modify a verb. "Persistent challenge" correctly functions as the subject complement following the linking verb "is." "How to" correctly introduces the infinitive noun clause. "Unmanned" correctly functions as an adjective modifying "submersible vehicles."

"Rapid" is incorrect and should be "rapidly." The sentence requires an adverb to modify the past participle "established," and adverbs — not adjectives — modify verbs and participles. "Commercial" correctly functions as an adjective modifying "telegraph line." "Telegraph line" correctly functions as part of the compound subject. "Established" correctly functions as the past participle in the passive construction "was established."

"Industrially" is incorrect and should be "industrial." The sentence requires an adjective to modify the noun "designers," as it describes the type of designers employed by the company. An adverb cannot modify a noun. "Recently have" correctly reflects subject-verb inversion triggered by the fronted adverb "only recently." "Succeeded in" correctly functions as a phrasal verb followed by the gerund "adapting." "Large-scale" correctly functions as a compound adjective modifying "production."

"Heavy" is incorrect and should be "heavily." The sentence requires an adverb to modify the verb phrase "depends on," describing the manner or degree of dependence. Adjectives cannot modify verbs. "Significant advances" correctly functions as a noun phrase within the prepositional phrase. "Automation" correctly functions as the object of the preposition "in." "Administration" correctly functions as the subject of the main clause.

"Only when combined" correctly triggers subject-verb inversion due to the fronted negative/restrictive adverbial "only when," which requires the auxiliary to precede the subject. "It is combined" is a full declarative clause that does not trigger inversion and makes the sentence grammatically inconsistent. "To combine it" is an infinitive phrase that cannot introduce the conditional structure the sentence requires. "When combined" introduces a valid time clause but does not trigger the inversion shown in the sentence, making it incompatible with the inverted structure "does the epoxy resin achieve."

"Negotiated" is the correct simple past verb form providing the main predicate for the sentence subject "Margaret Chan." "She negotiated" introduces a redundant subject pronoun, creating a double-subject construction that is grammatically incorrect. "Negotiating" is a present participle that cannot serve as the main verb without an auxiliary. "Who negotiated" creates a relative clause, leaving the sentence without a main verb.

"Fatally" is incorrect and should be "fatal." The sentence requires a predicate adjective following the linking verb "are" to describe the subject "strokes." Adjectives, not adverbs, follow linking verbs as subject complements. "Strokes" correctly functions as the plural subject of the sentence. "Approximately" correctly functions as an adverb modifying the percentage figure. "Reported cases" correctly functions as a noun phrase within the prepositional phrase.

"Adopted already" is incorrect in word order; the adverb "already" must be placed between the auxiliary verb and the past participle, giving "had already adopted." Placing "already" after the past participle is non-standard and grammatically incorrect. "By the end" correctly functions as a prepositional phrase establishing the time reference. "Comprehensive" correctly functions as an adjective modifying "legislation." "Data protection" correctly functions as a compound noun modifier.

"Exhibit" is incorrect and should be "exhibited." The sentence uses a passive construction — "is exhibited" — requiring the past participle form. "Exhibit" alone is a base verb form that cannot complete the passive structure. "New arts center" correctly functions as the object of the preposition "at." "A venue" correctly introduces the appositive noun phrase. "Remarkably" is noted as an adverb, though "design" also contains an error — it should be "designed" — making "exhibit" the primary and more clearly incorrect form among the options.

"Equally fascinate" is incorrect and should be "equally fascinating." The sentence requires an adjective to follow the linking verb construction "have proven," describing the quality of the excavation sites. "Equally fascinate" uses a verb form where an adjective is needed. "Excavation sites" correctly functions as the subject. "Containing remains" correctly functions as a participial phrase modifying the subject. "Smaller herbivores" correctly functions as part of the object noun phrase.

"Gave back" is incorrect and should be "given back." The sentence uses a passive construction — "was given back" — which requires the past participle form "given," not the simple past form "gave." "Only after" correctly functions as a subordinating conjunction introducing the time clause. "Filed" correctly functions as the simple past verb in the subordinate clause. "Formal complaint" correctly functions as the object of the verb "filed."