单项选择题

Doing your homework is a sure way to improve your test scores, and this is especially true ______it comes to classroom tests.

A. after
B. as

C. when

D. before
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There are signs ______ restaurants are becoming more popular with families.
A. that
B. which

C. in which
D. whose
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______ no gravity, there would be no air around the earth, hence no life.
A. If there had been

B. If there was
C. Had there been


D. Were there
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