选用适当的情态动词填空.(canmustshouldmay)
1.Wearegoingtohaveanexam.We_studyhardnow.
2."Bequiet"meansyou_notmakenoisehere.
3.Jackisill.He_notgotoschool.He_seethedoctor.
4.Lily_notskate,butshe_swim.
5.You_notsmokehere.It'sdangerous
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