Working hard is not only a __________ of great success, but it is among the essential requirements.
| A．sign |
| B．signal |
| C．mark |
| D．guarantee |
The traffic light is red, so I＿＿＿＿＿＿stop my car.
| A．must | B．have to | C．can | D．mustn’t |
—— Shall I tell John about it?
—— No, you＿＿＿＿. I don’t know his telephone number.
| A．needn’t | B．wouldn’t | C．mustn’t | D．shouldn’t |
—— May I leave the office before 5 o’clock in the afternoon?
—— No, I’m afraid you＿＿＿＿＿＿＿.
| A．needn’t | B．shouldn’t | C．mustn't | D．won’t |
He seldom listens to others. He＿＿＿＿＿answer for what he has done.
| A．shall | B．will | C．can | D．would |
—— Don’t forget to bring my new books tomorrow afternoon.
—— No, I＿＿＿＿＿＿＿.
| A．don’t | B．can’t | C．won’t | D．couldn’t |