This camera is of good quality. If it ______ break down within the first year, we would repair it at our expense.
| A．would | B．should | C．could | D．might |
________ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
| A．While | B．As | C．Because | D．If |
—I’m really hungry now.
That’s because you have left your lunch __________.
| A．having untouched | B．to be untouched |
| C．untouched | D．being untouched |
— How much do I owe you for this supper?
— _________. It’s nothing.
| A．You are welcome | B．Forget it |
| C．With pleasure | D．That’s all right |
When Marx was in London, he _______ read at the library for hours.
| A．would | B．might | C．could | D．should |
Help! My door shut after me and the eggs _________ in the pan.
| A．have been fried | B．are being fried |
| C．have been fried | D．are frying |