You _______ smoke .You are only 14 and it isn’t allowed.A. don’t have toB. mustn’tC. needn’t
Two and four is________.
--- What’s this, Xiao Hong? — It’s _____ orange.
Must we sweep the floor right now? No, you _______. You can do it later.
Excuse me, may I ask you some questions, Jane? OK, _______.
To fight SARS, we should ______ animals.