Dear，please tell me_________．
Because I'll have a long vocation without homework．（ ）
| A． |
why are you so happy |
| B． |
why you are so happy |
| C． |
why were you so happy |
Must I finish my homework first? No, you ________.
| A．mustn’t | B．don’t |
| C．can’t | D．needn’t. |
The girl is so excellent that you ________ praise her too much.
| A．mustn’t | B．shouldn’t |
| C．can’t | D．won’t |
—Listen! Someone is knocking at the door. Who _____it be?
—It_____ be Tom. He phoned to visit me this evening.
| A．may; may | B．may; shouldn’t |
| C．must; can | D．must; may |
---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 we go home mow ?
--- No, you____. You____ to go home until 5 o’clock.
| A．mustn’t; are allowed |
| B．don’t have to; are supposed |
| C．needn’t; aren’t allowed |
| D．can’t; aren't supposed |