单项选择题

Smoking is a very bad habit, which many people find difficult to ______.

A．break
B．beat
C．breathe
D．cough
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单项选择题
When the manager went to Canada on business, his ______ took over all his duties.
A．caretaker
B．officer
C．deputy
D．commander
单项选择题
As there was a power cut in the hospital, the surgeon had to ______ the operation.
A．call for
B．call on
C．call off
D．call up
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