题目内容

I tried to()my new boss with my diligence but in vain.
A concentrate
B investigate
C hesitate
D impress

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This room is for women() .
A typically
B exclusively
C precisely
D generally

Knowledge make() ; ignorance make proud.
A economical
B friendly
C kindness
D humble

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The policemen were told to be alert() the dangers they were facing.
A to
B in
C on
D at