The light is still on. They ___ to turn it off when they left the room.
| A．must forget | B．could have forgotten |
| C．may forget | D．must have forgotten |
Father made a promise ___ I passed the examination he would buy me an MP6 player.
| A．that | B．which | C．whether | D．that if |
There are so many viruses on the Internet. If ____ accidentally, the viruses may make
your computer break down.
| A．downloading | B．to be downloaded |
C．downl oaded |
D．being downloaded |
In front of our house _______ we used to swim.
| A．a river lies that | B．does a river lie where |
| C．lies a river which | D．lies a river where |
We were finally able to make the customers _______ of the quality of the refrigerator.
| A．to convince | B．convincing | C．convince | D．convinced |
He expects to _______ the business when his father retires.
A． pick up |
B．make sense | C．take over | D．make up |