_______ we couldn’t understand was _______ more and more students went abroad after graduation.
| A．What; because | B．That; because | C．Why; that | D．What; why |
You _____ him the news; he knew it already.
| A．needn’t tell | B．needn’t have told |
| C．mightn’t tell | D．mightn’t have told |
You _____ practise the drums while the baby is sleeping.
| A．needn’t | B．mightn’t | C．mustn’t | D．won’t |
The police still haven’t found her, but they’re doing all they _____.
| A．may | B．can | C．must | D．will |
The World Wide Web is sometimes jokingly called the World Wide Wait because it _________be very slow.
| A．should | B．must | C．will | D．can |
—The woman biologist stayed in Africa studying wild animals for 13 years before she returned.
— Oh, dear! She _________ a lot of difficulties!
| A．may go through | B．might go through |
| C．ought to have gone through | D．must have gone through |