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( ) 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 ．
A． enough old B． enough young C． old enough D．young enough
( )19．There are about five ____ young trees on the hill．
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 ．
A． enough old B． enough young C． old enough D．young enough
( )19．There are about five ____ young trees on the hill．
