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
The people are fully aware ______ they have before them problems and difficulties of various kinds.
A．of that
B．what
C．that
D．which
单项选择题
If motorists had to pay an extra tax to drive in cities, they ______ their ears a lot less.
A．use
B．will use
C．used
D．would use
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