单项选择题

If you ______ the bottle and cigarettes, you'll be much healthier.

A．take off
B．keep off
C．get off
D．set off
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单项选择题
We'd rather you ______ the account tomorrow.
A．settled
B．settle
C．would settle
D．will settle
单项选择题
When our university laboratory bought this microscope we were given a one year's ______.
A．reservation
B．security
C．proof
D．guarantee
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