单项选择题

The ______of marriage is still popular despite the high divorce rate.

A. institution
B. debate
C. institute
D. university
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单项选择题
I dislike going to the dentist as he uses the ______on my teeth.
A. pick
B. probe
C. bore
D. drill
单项选择题
They hung______at home waiting for a phone call and consequently missed the train.
A. up
B. back
C. about
D. down
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