单项选择题

It is not difficult for a person to ________ a bad habit.

A．pick up
B．make up
C．turn up
D．keep up
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单项选择题
60% of the population of the town ________ workers; things are different now.
A．is
B．are
C．was
D．were
单项选择题
The answer this question is known ________ us all.
A．to ;by
B．of; to
C．of; of
D．to; to
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