单项选择题

It is good manners for you to keep quiet in a library () other readers.

A. in case of
B. at first sight of
C. in front of
D. for the sake of

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单项选择题

The tramp was locked in the store ()

A. for his own mistakes
B. due to a misunderstanding
C. by accident
D. through an error of judgment

单项选择题

According to the passage, up. to now, antidrug education ()

A. has made all people see the danger of drugs
B. has succeeded in dissuading people from using drugs
C. has been effective only to a certain degree
D. has proved to be a total failure