– May I do the rest of the work tomorrow?

– Yes, of course. You _____ finish it today.

A. must                  B. mustn’t         C. needn’t          D. could

— May I do the homework tomorrow?

    一 No, you______. You should hand in before class tomorrow.

    A. mustn't     B. needn't            C. couldn't

— Must I do the rest of the work today?
— No, you _________  finish it tomorrow.