7 . First, we put on our spacesuits, which allow us to breathe in space and protect us from __________ (expose) to the cold and radiation. (所给词的适当形式填空)

9 . 单句语法改错
1. The physics lesson is many more interesting than the geography lesson.
2. The   hard you work, the more you will get.
3. Third-fourths of the earth’s surface are water.
4. It is necessary of us to practise English a lot.
5. So far, they understood everything that the teacher’s said.
6. The sixteen-years-old girl lives in the countryside in the northwest of China.
7. How a ride it is! They are pleased to jump!
8. The driver would like to avoid punished because of the traffic accident.
9. I would rather stay at the countryside than to go to cities.
10. The house is divided to different rooms.
11. We were very impressed about our headmaster’s speech.
12. It is so a small kitchen that I don’t have to do much to keep it clean.
13. There are a number of people on the spot and the number of them are about 2000.
14. Pollution of the river could be rather worst than I think.
15. I think the party begins at six o'clock but I’ll call to make sure.