From my point of view,the theory that by the scientist is not quite scientific.
----- The head teacher said we had only three days to finish the project. -------Don’t worry. We have already _________ two thirds of it.
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.
We work together to achieve our common purpose:_________world that is safer, cleaner and healthier than one we found.
_________ the wind and the sun, the color on the board gradually ran.
It is proposed that another meeting _______ to discuss how to give more support to the underdeveloped area.