—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 |
—What do you think we can do for our aged parents？
—You do anything except that you visit them as often as possible.
don’t have to B. oughtn’t to C. mustn’t D. shouldn’t
---May I remind you that Mr. White is waiting outside, Mrs. Green?
---Oh, I _________ all about it.
| A．forget | B．had forgotten | C．forgot | D．was forgetting |
Sixty miles ________ in a single night, so they were exhausted.
| A．were covered | B．have covered | C．was covered | D．has covered |
--- Had we been more careful, the accident might not have happened.
--- But we _____ at that time.
| A．hadn’t | B．didn’t | C．weren’t | D．might not |
He will stop showing off，if no notice of him．
| A．is taken | B．will be taken | C．taken | D．has taken |