用适当的情态动词(can, may, need, should, must) 填空 , 必要时用否定形式。 1.— Must w e hand in our homework today, Miss Chen? —No, you . You may hand it in tomorrow morning. 2.Look , little Jim is swimming so fast. I believe my eyes. 3.You look so weak! I think you go to see a doctor at once. 4.—Why we close that chemical factory? —Because it has caused lots of pollution. We need a better environment. 5.—Wow, another gift! What’s in the box? —I’m not sure. It be a pair of sp orts shoes.