What on earth did you tell her? The __________ on her face suggested that she was more than angry．
| A．impression | B．sight | C．appearance | D．Expression |
—She looks very happy. She ________ have passed the exam.
—I guess so. It's not difficult after all.
| A．should | B．must |
| C．could | D．might |
A survey has shown that 40% of those killed in traffic accidents ________ if they had been wearing seat belts.
| A．should have been saved |
| B．must have been saved |
| C．need have been saved |
| D．could have been saved |
—The research on the new flu virus vaccine is challenging and demanding.Who do you think can do the job?
—________ my students have a try?
| A．May | B．Must |
| C．Will | D．Shall |
—Mum, can I watch the TV program for another twenty minutes?
—Sorry, dear, it's time you ________ to bed.
| A．went | B．go |
| C．will go | D．must go |
________ him not to do so, he wouldn't have made such a serious mistake.
| A．If I persuaded | B．Did I persuade |
| C．Had I persuaded | D．If I should persuade |