--Lily said she couldn't lend you her bike until tomorrow.

--She________ . I have already borrowed one

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

 —You look tired.

—Yes, I ____ sleep last night.

A. needn’t           B. shouldn’t          C. mustn’t              D. couldn’t

—Must I finish my home work today?

—No, you _____. You may finish it tomorrow.

A．mustn’t              B．shouldn’t              C．needn’t              D．couldn’t

— Must I finish that work today?

— No, you _____. You may finish it in three days.