Identify the conjunction in the following sentence:

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: 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.

Correct Answer: B

Rationale: In the sentence, 'beautiful' is used as an adjective to describe the flowers. To transform the adjective 'beautiful' into an adverb, you add '-ly,' resulting in 'beautifully.' Adverbs modify verbs, adjectives, or other adverbs, offering more details on how an action is performed. Choice A ('beautiful') is the original adjective form and not the adverb form. Choice C ('beautification') is a noun, not an adverb. Choice D ('beautify') is a verb, not an adverb.

Correct Answer: C

Rationale: The past participle of a verb is used to form various tenses and passive voice constructions. In this case, 'explained' is the correct past participle form of the verb 'explain'. The sentence structure indicates a completed action in the past, which aligns with the use of the past participle. Choice A, 'explains,' is the present tense form of the verb, not the past participle. Choice B, 'explaining,' is the present participle form of the verb, not the past participle. Choice D, 'explanation,' is a noun derived from the verb 'explain,' not the past participle form of the verb itself.