If you have to go through a smoke-filled area，you’d better（）with your head low.

Buckmaster，a very tall basketball player，stood upright，（）over his small child friends.

A.snake
B.fountain
C.museum
D.towering

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It is reported that he never（）an operation （手术）without washing his hands.

A.railway
B.track
C.gay
D.pered

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