III:
1) Because I have a bad cold, so I didn't go to school yesterday.
2) Lan can sing very well although she can't play piano.
3) If we use the car all the time, we will make the air dirty.
4) Tea is the most popular drink in London.

IV:
1) The Nile is the longest river in the world.
- No river in the world is longer than The Nile.
2) We will probably visit Japan in the future.
- We might visit Japan in the future.

1.If we recycle bottles and cans, we will save the environment. What are you going to do this weekend ? I will have a hi-tech fridge that can cook meals. We visited our grandparents in the countryside last week. My future house will be on the ocean. Robots will help me do the housework. It will be surrounded by tall trees and blue sea. My brother is the tallest person in my family. 2.He will get a cup of coffee next morning. The teacher won’t punish that student. If he doesn’t eat breakfast, he will be hungry. We can reuse bottles and cans. We shouldn’t throw rubbish on the street. 3. I didn’t go to school yesterday because I had a bad cold. Although Lan can sing very well, she can’t play the piano. We will make the air dirty if we use the car all the time. The most popular drink in London is tea. 4.No river is as long as the Nile river. We might visit Japan in the future.