People started to dig in the area for treasure, ____ caused much damage.
| A．which | B．where | C．what | D．that |
—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 |
—Look at the full moon. How beautiful it is!
—How I wish I ________ on it some day!
| A．were | B．am |
| C．would be | D．will be |
The school recommends parents ________ their children to swim in rivers or lakes during summer holidays.
| A．not permit | B．do not permit |
| C．mustn't permit | D．couldn't permit |