---- There’s no light on. ---- They ________ be at home.
| A．can’t | B．mustn’t | C．needn’t | D．oughtn’t to |
.---I didn't go to work yesterday because my car broke down.
---You ____ mine. I wasn't using it then.
| A．might borrow | B．could have borrowed |
| C．must have borrowed | D．ought to borrow |
The employee must have been dismissed by the employer last month, ____ he?
| A．haven't | B．hasn't | C．didn't | D．wasn't |
____has been said before, it is not easy to learn a foreign language.
| A．As | B．It | C．What | D．As it |
Tim Bemers-Lee is generally considered ____ the World Wide Web, on which all the information is shared by all.
| A．to have founded | B．having founded | C．founding | D．to found |
Was it in this very room ____ he made up his mind ____ he should break away from his family?
| A．that; which | B．which; that | C．which; which | D．that; that |