情态动词.doc I . 选用 can, may, must, can’t, mustn’t, could 填空。 1. There is air around us, but we ________ see it. 2. You _______ play football in the busy street. 3. It _______ be Mr. Brown. He has gone to America. 4. Tom _______ come to my birthday party, but I’m not sure. 5. _______ you please give me some water ?