单项选择题

We tried to __________the nervous old lady that flying was safe.

A．secure
B．ensure
C．assure
D．certify
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单项选择题
It would be a mistake to__________this law to situations which are outside this range.
A．apply
B．employ
C．use
D．fit
单项选择题
Say__________what you mean and then there will be no misunderstanding.
A．casually
B．eventually
C．necessary
D．precisely
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