____ he was not rich enough to buy whatever he wanted, Edison decided to make his new laboratory the best.
| A．Although | B．Since | C．When | D．As |
I’ m sorry, I mistook you ___ your sister ___ mistake.
| A．for, by | B．by, for | C．by, by | D．for, for |
The scientists are trying to ___ natural energy to decrease air pollution.
| A．make friends with | B．make full use of | C．make notes of | D．make into |
China is ___ the east of Asia while Japan is ___ the east of China.
| A．in, on | B．on, to | C．in, to | D．to, on |
He spoke so slowly that we all could ___ him.
| A．catches | B．follow | C．understood | D．hearing |
I ___in North China, but now I ___ the weather in South China.
| A．used to live, am used to | B．used to living ; used to | C．was used to living; am used to | D．used to live; uesd to |