单项选择题

Whatever you do, you ______ click with the right mouse button or the program will crash.

A．must not
B．don't have to
C．doesn't have to
D．needn't
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单项选择题
It is necessary that anyone ______ exercises every day if he wishes to keep healthy.
A．would do
B．will do
C．did
D．do
单项选择题
I cannot sleep. The dog next door is making too much noise. I wish it ______ quiet.
A．kept
B．would keep
C．had kept
D．to keep
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