一、单项选择
1. --- Can you swim in the river?
--- No, I _____.
A. mustn’t B. may not C. can’t D. needn’t
2. --- Ｍay I go swimming now?
--- No, you ______. You must finish your homework first.
A. mustn’t B. may not C. couldn’t D. needn’t
3 . --- Excuse me. Where is the zoo?
--- Sorry, I don’t know. Ask that policeman. He _____ know.
A. shall B. may C. need D. would
4. __________ I finish the work today? No, you needn’t.
A. Must B. May C. Can D. Need
