— Are Jiangsu and Zhejiang famous for silk?
— I think so. I know, more than half of the silk in China is produced in Jiangsu and Zhejiang.
| A．As long as | B．As far as |
| C．As many as | D．As little as |
We won’t put off our plan __________ it snows heavily tomorrow.
| A．whether | B．unless |
| C．because | D．While |
______ he talked with her for a long time, he failed to convince(说服)her.
| A．Though | B．But | C．Since | D．As |
Take a map with you while traveling ________ you have a guide or know the city well．
| A．since | B．if | C．unless | D．because |
- The air pollution is terrible.
- It will be worse ________ we take action to protect the environment.
| A．if | B．unless | C．until | D．when |
She has worked in this factory ______ she came here in 2010.
| A． when | B． since | C．for | D．from |