单项选择题

Many students ______ in spite of the difficult conditions.

A．carry out
B．carry on
C．carry off
D．carry forward
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单项选择题
The boss told his secretary to ______ the documents for later use.
A．put away
B．turn on
C．make up
D．break out
单项选择题
The man doesn't have to worry about his car because he has ______ it against accident.
A．secured
B．assured
C．insured
D．ensured
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