15. Which sentence contains both an adverb and a conjunction?

A. Don't imagine you can't do as you wish.
B. Lucille was a kind person, but she hated people who spread rumors.
C. Do you want the shrimp or the crab?
[D. Lawson crept silently up the stairs, but couldn't still his heartbeat]

Right! :-)

The sentence that contains both an adverb and a conjunction is option D. "Lawson crept silently up the stairs, but couldn't still his heartbeat."

To identify the adverb and the conjunction in this sentence, we first need to understand what adverbs and conjunctions are.

An adverb is a word that modifies or describes a verb, an adjective, or another adverb. It often provides information about the manner, place, time, frequency, degree, or reason of an action or event.

A conjunction, on the other hand, is a word that connects words, phrases, or clauses in a sentence. It shows the relationship between these elements.

In the given sentence, the adverb is "silently," which modifies the verb "crept." It describes how Lawson was creeping up the stairs.

The conjunction in the sentence is "but," which connects two independent clauses. It indicates a contrast or opposition between the two ideas expressed in the clauses.

So, in option D, the sentence "Lawson crept silently up the stairs, but couldn't still his heartbeat" contains both an adverb ("silently") and a conjunction ("but").