Choose the best option :
1. I ____help you if you want. (must/can/may)
2. You_____ finish half of the work yesterday. (could/may/can)
3. I _____ sleep well yesterday (can't/mustn't/couldn't)
4. Pupils _____be late for classes. (can/may/must/mustn't)
5. We _____show these photos to her. (must/mustn't/can/can't)
6. Granny is sleeping. You______ make a nolse. (must/can't/mustn't)
7. People _____take care of nature. (can/may/must/should).
8. People _____live on the Mocn. (must/may/can/can't)
9. Children ______go to bed late. (can/shouldn't/may)
10. Max _______take my umbrella. (must/can/may)