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5.—Can I smoke here?
—No.In no circumstances________in the library.
A.smoking permits
B.smoking is permitted
C.does smoking permit
D.is smoking permitted
专家解析：考查倒装句。in no circumstances 表示否定，意思是“决不，在任何情况下都不”，放在句首时，句子要倒装，由此排除A、B两项;根据句意可知，permit应该用于被动语态，所以D项正确。
【答案】 D
6. Only when class began________that he had left his book at home.
A.will he realize
B.he did realize
C.did he realize
D.should he realize
专家解析：考查倒装句，当only+状语位于句首时，主句要用部分倒装形式。
【答案】 C
7. Little________about H1N1 so far，so there is no doubt that many people are afraid when talking about the disease.
A.did scientists known
B.scientists have known
C.have scientists known
D.had scientists known
专家解析：本题考查时态和倒装。根据关键词so far，可以确定用现在完成时，故排除A、D两项;little表示否定，放句首要倒装。
【答案】 C
8. “By no means，” declared the captain.“________give way to disappointment.”
A.we would
B.we will
C.might we
D.shall we
专家解析：考查倒装句型。by no means位于句首句子要倒装，根据句意应该用shall we。
【答案】 D
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