A.must | B.may | C.need | D.Can |
A.could | B.should | C.need | D.Would |
A.would | B.should | C.had better | D.might |
A.must | B.need | C.should | D.Might |
A.can they be | B.they can be | C.can be | D.they can |
A.mustn’t | B.shan’t | C.shouldn’t | D.needn’t |
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