News reports say peace talks between the two countries _______ with no agreement reached.
| A．have broken down |
| B．have broken out |
| C．have broken in |
| D．have broken up |
According to the air traffic rules, you ___ switch off your mobile phone before boarding.
| A．may | B．can | C．would | D．should |
When I was young, I was told that I ______ play with matches
| A．wouldn't | B．needn't | C．mustn't | D．daren't |
-What sort of house do you want to have? Something big?
--Well, it ______ be big--that's not important.
| A．mustn't | B．needn't | C．can't | D．won't |
Although this ____ sound like a simple task, great care is needed.
| A．must | B．may | C．shall | D．should |
—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 |