Don't forget ______ the light when you leave the office.
| A．switching over | B．to turn on |
| C．to switch on | D．to switch off |
Last Monday, I bought a second-hand computer, ______ was very slow.
| A．which price | B．its price | C．the price of whose | D．the price of which |
The lecture hall______ by Doctor Li in the 1980s can contain at most 6,000 people.
| A．set up | B．was set up | C．is set up | D．setting up |
That day, we______ for the train station when Tom fell and hurt his legs badly.
| A．have been leaving | B．were just about to leave |
| C．have left | D．are just going to leave |
Mr Smith closed all the windows while driving______ he wouldn’t catch a cold.
| A．since | B．so that | C．because | D．as if |
______ is a possibility______ Jim will get first place in the long jump.
| A．It; whether | B．There; whether | C．It; that | D．There; that |