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. before
B. as
C. since
D. when
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单项选择题
There comes a time in every man's life ________.
A. then he has to think
B. which he needs
C. when he has to think
D. therefore he has to work hard
单项选择题
They exchanged a few _______.
A. how-are-you
B. how-are-you's
C. how-are-yous
D. how-are-yours
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