单项选择题

She keeps a supply of candles in the house in case of power （）.

A.failure
B.lack
C.absence
D.drop

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单项选择题

A healthy life is frequently thought to be（）with the open countryside and home-grown food．

A.tied
B.related
C.involved
D.associated

单项选择题

We must know what we should do and what we should avoida（）good impression on others in public place．

A.to leave
B.leaving
C.to have left
D.leave

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