单项选择题

Air, water and food is ______ to good health.

A．vital
B．convenient
C．important
D．sufficient
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单项选择题
He has just ______ to a letter from a friend of his in Japan.
A．answered
B．offered
C．returned
D．replied
单项选择题
I ______ that you and Jim and Bill have all finished this work.
A．doubt
B．show
C．display
D．suspect
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