— What’s happened to my library books?
— ____ .
| A．I’ve no idea | B．You borrowed them from the library |
| C．You bought them yesterday | D．They’re about wild animals |
You _____ practise the drums while the baby is sleeping.
| A．needn’t | B．mightn’t |
| C．mustn’t | D．won’t |
The police still haven’t found her, but they’re doing all they _____.
| A．may | B．can |
| C．must | D．will |
It’s a very kind offer, but I really _____ accept it.
| A．mustn’t | B．needn’t |
| C．can’t | D．don’t |
That car nearly hit me; I ______.
| A．might be killed | B．might have been killed |
| C．may be killed | D．may been killed |
“I called you yesterday. A woman answered, but I didn’t recognize her voice.” “Oh, it _____ my aunt Jean.”
| A．must be | B．must have been |
| C．might be | D．can have been |