In some cases, different approaches __________ the same scientific problem lead to the conflicting theory.
| A．to | B．of |
| C．in | D．for |
The boy was so tired that he fell asleep _____________ his mother could take off his clothes．
| A．before | B．after | C．while | D．where |
—Why not find a new job?
—Why should I? I _____________ as much，but I like what I'm doing．
| A．didn't earn | B．don't earn |
| C．hadn't earned | D．haven’t earned |
Advertising can influence consumers' moods，_______________ in turn，can influence consumers’reactions to products．
| A．that | B．which | C．where | D．when |
The scientist spent years alone in the forest，_____________ by eating wild fruit and small animals．
| A．surviving | B．survived |
| C．to survive | D．having survived |
—Will you take part in the speech contest？
—____________ I have long been expecting such an activity．
| A．Not at a11． | B．It’s my pleasure． |
| C．But why? | D．That’s for sure． |