Always acting in a strange way, Einstein must have ___appear to people around to be mad.
| A．shown | B．imagined | C．appeared | D．thought |
--- Who’s the man giving the speech?
--- Well, if you ____ know, his name is Lyric.
| A．may | B．can | C．shall | D．must |
—I did not know you were good friends.
—You__________. I have known her since she moved here. You were abroad then.
| A．may have | B．needn’t have | C．couldn’t have | D．must have |
-----Is it good to look up every new word when I come across it in reading?
-----No. You _______ because you are likely to guess the meaning from the context.
| A．can’t | B．mustn’t | C．don’t have to | D．shouldn’t |
—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 |