单项选择题

You should ________ your room now and then to keep it supplied with fresh air.

A. ventilate
B. versatile
C. verify
D. versify
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单项选择题
______ his poor record in school, the board thinks that he should study hard.
A. In spite of
B. In charge of
C. In view of
D. In case of
单项选择题
Research findings show that we spend about two hours dreaming every night no matter what we______ dialog the day.
A. should have done
B. would have done
C. may have done
D. must have done
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