单项选择题

It is required that such insulator (绝热体) ______ a heat resistant material.

A．must be made of
B．should be made of
C．will be made of
D．would be made of
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单项选择题
The paint is still wet. ______!
A．Be not sure to touch it
B．Be sure not to touch it
C．Be sure to not touch it
D．Don't be sure to touch it
单项选择题
You will be given a ticket if you ______ the speed limit.
A．proceed
B．exceed
C．succeed
D．precede
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