It is believed to _____ over by sandstorms from AD 200 to AD 400.
| A．gradually cover | B．be gradually being covered |
| C．have been gradually covered | D．be gradually covered |
—Look, John’s fallen asleep.— Oh, he _______ too late last night.
| A．might sit up | B．should have sat up | C．could sit up | D．must have sat up |
—Mum, I climbed to get the Teddy Bear from the top of the shelf.—My goodness! You _______ yourself. You ______ do that next time.
| A．must have hurt; mustn’t | B．should have hurt; can’t |
C．may have hurt; mustn’t | D．might have hurt; won’t be able to |
—I went to work on foot yesterday, though it _________ cats and dogs.—You __________ by bus. It was likely to get a cold.
| A．is raining; must have gone | B．rained; would go |
C．was mining; should have gone | D．have rained; could have gone |
Haven’t I told you that you __________ have the answer tomorrow morning?
| A．will | B．shall | C．should | D．would |
Jane’s pale face suggested that she ____ ill, and her parents suggested that she ____ a medical examination.A be; should have B was; have C should be; had D was; has