二、单项选择.(15分)
( ) 16.Her parents will come back ________________ two weeks.
A.after B next C.in D later
( ) 17.Things will get better in the future, we will have ______ cars and _______ pollution.
A.less, more B. Fewer,less C. more, more D.less, fewer
( )18.The boy is ______to go to school .

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