－Everyone in my class passed the exam.
－Oh，really? It________difficult.
| A．can't have been |
| B．needn't have been |
| C．must be |
| D．mightn't be |
I ________ use a clock to wake meup because at six o’clock each morning the train comes by my house.
| A．couldn’t |
| B．mustn’t |
| C．shouldn’t |
| D．needn’t |
—________you interrupt now? Can’t you see I’m on the phone?
Sorry sir, but it’s urgent.
| A．Can |
| B．Should |
| C．Must |
| D．Would |
I’m going to Europe on vacation together with John if I ________ find the money.
| A．can |
| B．might |
| C．would |
| D．need |
The door ________ open, no matter how hard she pushed.
| A．shouldn’t |
| B．couldn’t |
| C．wouldn’t |
| D．mightn’t |
No one ________ be more generous; he has a heart of gold.
| A．could |
| B．must |
| C．dare |
| D．need |