单项选择题

If you can't turn the key, try ______ some oil in the lock.

A．to put
B．put
C．putting
D．to have put
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单项选择题
I'm disappointed with the new officers elected in our club, but there is no point ______ about it.
A．to worry
B．in worrying
C．with us worrying
D．if we worry
单项选择题
His government insisted that he ______ until he finished his degree.
A．would stay
B．stay
C．stayed
D．shall stay
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