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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Are you ______of travel
A．sure
B．proud
C．certain
D．fond
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
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