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B.his
C.their
D.your 2.(.5分)﹣Sam,what do you often do ______ the science club? ﹣We do many interesting experiments.( )
A.of
B.in
C.to
D.on 3.(.5分)Hurry up, you will miss the train.( )
A.and
B.but
C.or
D.so 4.(.5分)﹣Mom, must I clean my room now? ﹣No, you .You can do it after dinner.( )
A.needn't
B.mustn't
C.shouldn't
D.can't 5.(.5分)﹣______ do you visit your grandparents? ﹣Once a week.We usually have a big dinner together.( )
A.How long
B.How far
C.How often
D.How much 6.(.5分)The ______ you climb,the more you can see
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