There are many factors that _________ the popularity of the 3G cell phone．Higher speed of surfing the Internet is one．
| A．answer for | B．provide for |
| C．account for | D．apply for |
I don’t think David could have done such a stupid thing last night, ____?
| A．did he | B．didn’t he |
| C．do I | D．don’t I |
We had tried everything to improve their living conditions,but it made little .
| A．good | B．use |
| C．result | D．difference |
He is my father and I know he will forgive me for _______ I have done.
| A．whatever | B．no matter what |
| C．no matter how | D．whichever |
The number of people out of job over 4,000,but a number of them to apply for different jobs.
| A．are;are trying | B．are;is trying |
| C．is;are trying | D．is;is trying |
When I visited her,she was in writing a lecture speech on Chinese history.
| A．absorbing | B．concentrated |
| C．devoted | D．occupied |