单项选择题

You ______ buy a gift, but you can if you want to.

A. must

B. mustn't
C. have to
D. don't have to
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单项选择题
______ before you leave the lab.
A．Make sure that the windows are shut
B．To make sure that the windows are shut
C．Making sure to shut the windows
D．To be sure to shut the windows
单项选择题
I was impressed______the efficiency of the work done in the company.
A. in

B. about

C. with

D. for
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