Identify the adverb in the following sentence:

Correct Answer: B

Rationale: An adverb modifies verbs, adjectives, or other adverbs. In this sentence, 'anxiously' describes how the patient 'waited'. Therefore, the adverb in the sentence is 'anxiously'. Choice A, 'waited', is a verb and not an adverb. Choice C, 'doctor's', is a possessive noun and not an adverb. Choice D, 'news', is a noun and not an adverb. The correct adverb that modifies the verb 'waited' in the sentence is 'anxiously'.

Correct Answer: C

Rationale: The correct answer is 'C: but.' Conjunctions are words that connect words, phrases, or clauses. In the sentence 'He went to the store, but they were already closed,' 'but' is a conjunction that joins two contrasting ideas - him going to the store and finding it closed. Choice 'A: went' is a verb, not a conjunction. Choice 'B: to' is a preposition, not a conjunction. Choice 'D: they' is a pronoun, not a conjunction.

Correct Answer: C

Rationale: The determiner in the sentence is 'few.' Determiners specify the quantity or identity of a noun. In this case, 'few' indicates the number of birds present. Choice A, 'happily,' is an adverb modifying a verb or an adjective, not a determiner. Choice B, 'branches,' is a noun referring to parts of a tree, not a determiner. Choice D, 'tree,' is a noun identifying the main subject of the sentence, not a determiner.

Correct Answer: B

Rationale: The past tense of the verb 'discover' is 'discovered.' In this case, the scientist already found a new species of butterfly, indicating a past action. 'Discovered' is the correct past tense form of 'discover.' The other options do not represent the past tense form of the verb. 'Discovers' is present tense, 'discovering' is present participle, and 'discovery' is a noun, not a verb tense.

Correct Answer: C

Rationale: The comparative form of the adjective 'careful' is 'more careful' when comparing two things. In this context, it is comparing the level of care in examining the patient, indicating a higher degree of care than just 'careful.' Choice A, 'careful,' is the positive form of the adjective and not comparative. Choice B, 'carelessly,' is an adverb that conveys the opposite meaning. Choice D, 'most careful,' is the superlative form of the adjective, indicating the highest degree of care, not the comparative form.