C. Clever, because it has two syllables, cle-ver. The second syllable is "drawn out" to be made longer, which makes it a iamb.
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The main clause is "Chris's chief interest was tennis".
The subordinate clause is "Which he was just learning to play" and it is an adjective clause because it describes what the "tennis" was like. Tennis is an object and this subordinate clause further describes that it is the tennis that he was trying to learn.
I think that the answer is B. Brackets can indicate a change in verb tense
<span>The postal carrier ran around the gate to escape the angry bulldog.</span>
C , an adverb describes the verb . The verb is impressive . What is in impressive ? C the model bridge is impressive . Therefore C is the adverb .