=>
I/
1. To stay healthy you eat more vegetable and less high-fat food.
2. To prevent flu, we eat a lot of garlic and keep our bodies especially feet warm.
3. It began to rain, so I opened my umbrella.
4. It began to rain, but he didn't open his umbrella.
5. He worked hard, so he could earn much money.
6. Study hard or you will fail the exam.
7. Dan didn't study the exam, but Lan did.
8. I understand your point of view. However, I don't agree with it.
9. He lied to her, but she still likes and trusts him.
10. It begane to get dark, so I turned on the light.
II/
1. many
2. a litlle
3. more
4. less
5. a lot of
6. much
7. much
8. a lot of
9. a lot of
10. much/few