1.  I couldn't.

2.  People could belive him and support him.

3.  you can write with you hand "" oh really?"

4.  I can run there where I want to.

5.  What can we solve this problem?

6.  We can gain experiences which will benefite us after we step into the world.

7.  You can.

8.  All of these lead to global shortage of fresh water.What can we do in this situation?

9.  They can't we do something good for the patients who are on the verge of death ?