---May I surf the Internet tonight?
--- No, you ______. You must do the exercises.
| A．needn’t | B．won’t | C．mustn’t | D．don’t |
— Do you think the MP3 player put its listener ________?
— Yes, too much use of it could lead to hearing loss, experts say.
| A．under control | B．at risk | C．in use | D．on top |
I am badly off. If I ______ money, I ______ a large house.
| A．have; would have | B．had; will buy |
| C．had; would buy | D．would have; would buy |
Only when I left my parents for Italy _______ how much I loved them.
| A．I realized | B． I had realized | C．had I realized | D．did I realize |
It was not until midnight _________ they reached the camp site.
| A．that | B．when | C．while | D．as |
— Did you meet with the famous space hero?
— ___________ I had come here earlier.
| A．If only | B．If not | C．But for | D．For fear |