While working in the countryside, the students a great deal of knowledge on plant life.
| A．looked up | B．picked up | C．put up | D．called up |
I was on the highway when this car went past fol. Lowed by a police car. They ______ at least 150 kilometers an hour.
| A．should have been doing | B．must have been doing |
| C．could have done | D．would have done |
There _____ be any difficulty about passing the road test since you have practiced a lot in the driving school.
| A．mustn’t | B．shan’t | C．shouldn’t | D．needn’t |
I ______ have been more than six years old when the accident happened.
| A．shouldn’t | B．couldn’t | C．mustn’t | D．needn’t |
John, look at the time. ______ you play the piano at such a late hour ?
| A．Must | B．Can | C．May | D．Need |
Tom, you _____ leave all you clothes on the floor like this !
| A．wouldn’t | B．mustn’t | C．needn’t | D．may not |