why（）we eat out when we can easily cook ourselves at home？

You（）not leave your post．or you will be punished．

A.may
B.shall
C.will
D.need

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All I can say is，go there，go now，apologize on your knees．Ask what you（）possibly do to make up for it．

A.could
B.will
C.must
D.should

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