给下列句子选择恰当的情态动词。
1. ________ (Can/Must) you play football well, Tom?
2. We________ (can't/mustn't) cross the road. The light is red.
3. I________ (can't/mustn't) see any birds in the tree.
4. ________ (Would/Must) you like a glass of juice?
5. The students _______ (can/must) keep their desks and chairs clean.