The teacher asked the students to do the experiment __________ small groups.
| A．to | B．for | C．on | D．in |
What will people die of in 100 years? If you think that is a simple question, you ______ attention to the revolution taking place in biotechnology．
| A．have not been paying | B．had not been paying |
| C．were not paying | D．will not be paying |
The girl wearing a pair of dark glasses comes from a city in South China, ______ is evident from her accent．
| A．who | B．that | C．where | D．as |
It was not until I was injured in a car accident ______ the real American society．
| A．that I found out | B．when I found out |
| C．did I find out | D．that did I find out |
The old lady who caught a bad cold complained that the doctor was ______ too much for the treatment given to her．
| A．paying | B．offering | C．spending | D．charging |
Watch out for these animals! They could be terrified ______ a sudden loud noise．
| A．being there | B．should there be |
| C．there was | D．there have been |