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16.Will you come to see the film with me? ----____. A.No， I dont B.sorry， I cant C.Yes， I am D.Yes， I wasnt 17.I ____ keep the book a little longer? ----Yes, you can. A.Must B.Need C.Can D.Should 18. ____ I watch TV this evening， Mum? ----Yes, you ____ . A.May; may B.must; can C.Must; may D.Need; need 19.Mike must work harder at his lessons， ____ ? A.neednt he B.mustnt he C.doesnt he D.isnt he 20.May I go now? ----No, you ____ , You ____ stay here. A.needn here to B.neednt must C.mustn have to D.needn has do 21.Tom ____ it if he doesnt want to. A.doesnt need to B.need not to do C.needs not to do D.need not do 22.Put on more clothes. You ____ be feeling cold with only a shirt on. | 
