单项选择题

The vacuum cleaner is a valuable labor-saving ______.

A. device
B. engine
C. piece
D. instrument
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单项选择题
Ability to get along with people is an asset in business.
A. an advantage
B. a property
C. a possession
D. a benefit
单项选择题
After their meeting, both men described the talks as frank, friendly and ____.
A. construct
B. construction
C. constructive
D. contract
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