Don’t leave your work .
| A．done half | B．half done | C．a half done | D．done a have |
It’s too bad that I failed in the math exam. If only I ______ hard at it!
| A．worked | B．had worked | C．has worked | D．would work |
The last decade of the 21st century ________ the rapid, steady development of China in various fields.
| A．witnessed | B．was witnessed | C．is witnessed | D．had witnessed |
---He should have been warned of the danger.
---_______, but he wouldn’t listen to me.
| A．So he had | B．So had he | C．So was he | D．So he was |
The teacher asked the two students to discuss the question in a low voice ________ they should bother the others.
| A．so that | B．in case | C．in order that | D．now that |
It was in the lab ___was taken charge of by our teacher____ they did the experiment.
| A．which; that | B．where; which | C．which; where | D．that; where |