单句改错题：
1. Your family is very kind. I'll never forget the favor you've done me.
2. When and where to build the new school haven't been decided.
3. Three quarters of the land is covered with green grass while the rest are covered withpine trees.
4. Not even one of the hundred students who took the test have passed.
5. On each side of the street stands a lot of trees.
6. There seem to be a knife and fork on the table.
7. The students in our school each has known the meaning of WTO.
8. The number of people who own cars are increasing.
9. Such people as he is to be punished.
10.It were Tom and John who played a trick on the old man.