题目
A.A. if
B.B. then
C.C. when
第2题
A.Exercise
B.To exercise
C.Should exercise
第3题
() every week for several hours is good to keep healthy.
A.Exercise
B.To exercise
C.Should exercise
第9题
______ will do you good to do some exercise every morning.
A.It B.There C.Those D.You
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