单项选择题

There is not much time left for you to cover everything you'd better ______ unimportant points.

A．leave off
B．focus on
C．leave out
D．concentrate on
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单项选择题
Respect for the law is the foundation of civilized living. ______ breaks it will be punished.
A．Who
B．Whichever
C．Whoever
D．Whomever
单项选择题
If______, he promises that he will spare no effort in promoting public welfare.
A．elected
B．elect
C．electing
D．being elected
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