. — She looks very happy. She __________ have passed the exam.
— I guess so. It’s not difficult after all.
| A．should | B．could |
| C．must | D．might |
. The biggest problem for most plants, which ___ just get up and run away when threatened, is that animals like to eat them.
| A．shan’t | B．can’t |
| C．needn’t | D．mustn’t |
. My MP4 player isn’t in my bag. Where __________ I have put it?
| A．can | B．must |
| C．should | D．would |
. In crowded places like airports and railway stations, you __________ take care of your luggage.
| A．can | B．may |
| C．must | D．will |
. The teacher __________ have thought Johnson was worth it or she wouldn’t have wasted time on him, I suppose.
| A．should | B．can |
| C．would | D．must |