单项选择题

We must （） on our reputation to expand the business.

A. improve
B. build
C. develop
D. weigh

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单项选择题
With three young children to take care of, Cathy is kept on the run every minute of the day.（）

A. walking
B. at full speed
C. busy
D. on foot
单项选择题
A （） examination for the post of department manager will be held next Tuesday.

A. classifying
B. comparing
C. contrasting
D. competitive
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