So sudden __________ that the residents had no time to escape.
| A．was the earthquake | B．did the earthquake |
| C．the earthquake did | D．the earthquake was |
---Can I tell my best friend about it?
---No. I don’t want anyone else to know. You _________ let it out.
| A．mustn’t | B．won’t | C．don’t have to | D．don’t need to |
--- 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