— How did you do in your essay?
— I got ______ okay grade, but Mr．Jones gave Sarah top marks．She’s ______ teacher’s pet, you know.
| A．不填; a | B．an; 不填 |
| C．不填; the | D．an; a |
Whenever I made mistakes，the teacher pointed them out with________.
| A．curiosity | B．satisfaction |
| C．envy | D．patience |
I found Jane________at the desk，________her homework carefully.
| A．seated；doing | B．sitting；does |
| C．be seated；does | D．sit；do |
Much to our surprise，the witness’s________of the traffic accident differed from the official version in several aspects.
| A．account | B．opinion |
| C．instruction | D．explanation |
China is developing fast.That’s________I think those of my colleagues who deal with China affairs should visit China.
| A．because | B．why |
| C．when | D．how |
Our bad living habits will destroy the earth.Only by changing________we live can we save the earth.
| A．that | B．what |
| C．how | D．where |