II.
1. You'd better not eat too much fatty foood.
2. The bad weather made we stop our picnic. 
3. Miss Lan is a fast runner.
4. Because Lan was sick/ got sick, she didn't go to school yesterday.
5. We had a two-month summer vacation.
6. If we water these plants, they won't die.

III.
1. What would you do if you had a plastic bottles at home?
2. Try to find creative ways to reuse old things before throwing
3. Henry thinks we will stay on the Moon for a long time.
4. A wireless TV will help us watch other planets.
5. It looks like a UFO but it's my house in the future.
6. Have you ever eaten an ice-cream in the winter?
7. The beaches in Sydney are the cleanest beaches in the world?