His sister left home in 1998, and _______since.
| A．had not been heard of | B．has not been heard of |
| C．had not heard of | D．has not heard of |
Take care! _______ to frequent smog does great harm to your health.
| A．Exposing | B．To expose |
| C．Exposed | D．Being exposed |
Anyone _______ be in a rough life time, whether he is “Bai Fumei” or “Gao Fushuai.”
| A．must | B．will | C．can | D．should |
It is Tom as well as his two friends that _______ for the job.
| A．have applied | B．have been applied |
| C．has applied | D．has been applied |
You may depend on it_______ I shall always help you.
| A．that | B．what | C．which | D．whether |
--Would you mind giving me advice on how to improve my record?
--If you make _______ most of your potential, there will be ________ rise in your achievement.
| A．不填；不填 | B．the; a |
| C．不填; a | D．the; 不填 |