The coasted areas have mild winters, but ____ the central plains become extremely cold.
| A．by contrast | B．with contrast | C．contrast | D．contrasting |
He removed the tree ____________ it was the best in the ground.
| A．when | B．if | C．because | D．as |
The young man，who by then admission to university，decided to do some part-time jobs to gain more practical experience．
| A．gained | B．was gaining | C．has gained | D．had gained |
----- The head teacher said we had only three days to finish the project.
-------Don’t worry. We have already _________ two thirds of it.
| A．taken over | B．got through | C．made up | D．come along |
A big earthquake __________7.1 on the Richter scale struck Yushu, knocking down buildings and causing more than two thousands people to lose their lives．
| A．measured | B．measuring | C．to be measured | D．measures |
We work together to achieve our common purpose：_________world that is safer, cleaner and healthier than one we found．
| A．the；the | B．a；不填 | C．a；the | D．the；不填 |