单项选择题

The headmaster warned him to （）his ways if he wanted to stay at the school.

A. repair
B. restore
C. mend
D. protect

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单项选择题
He has made a very serious mistake in his planning. He has forgotten that the rule is only （）to the U.S. citizen.

A. competent
B. suitable
C. appropriate
D. applicable
单项选择题
Modern medicine and new methods of food production allow adults to live longer and babies to （）easier.

A. exist
B. extinct
C. survive
D. revive
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