单项选择题

We are kept ______ by clean air.

A. health
B. healthy
C. healthily
D. to be healthy
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单项选择题
He ______ me what your name was.
A. told
B. asked
C. said
D. Both A and B
单项选择题
My home is about ______ from my school.
A. 15 minutes

B. 10 minute’s ride
C. 20 minutes by bike
D. 15-minute’s on foot.
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