1. If we recycle more, we (help) .. ………………………… the earth. 2. Factories (not dump)… ………………. waste into the rivers if the government fines them heavy. 3. If people travel to work by bus, there (be) ………………….…….. fewer cars fumes. 4. We will save thousands of trees if we (not waste)……………………….. paper. 5. If we use waste water carefully, more people (have)…………...…… fresh water. 6. If you (be)……………..…. the president, what ………………..you (do)……………….? 7. They get sick so often. If they (exercise)…………… more, they (be)……….. healthier. 8. If I (have)……………… one million US dollars, I (build)…………….. more parks in our city. 9. Ngoc’s mother is unhappy. If Ngoc (tidy)……………..……..……….. her room every day, her mother (not be)……………………… so upset. 10. There isn’t a garden at our house. If there (be)……….., we (grow)……………….…..vegetables.

Cách làm:

1. Điền động từ vào chỗ trống để hoàn thành câu.
2. Sử dụng dạng đúng của động từ để hoàn thành câu.
3. Điền dạng thích hợp của động từ vào chỗ trống.
4. Điền dạng phù hợp của động từ vào chỗ trống.
5. Sử dụng dạng đúng của động từ để hoàn thành câu.
6. Sử dụng dạng thích hợp của động từ để hoàn thành câu.
7. Sử dụng dạng đúng của động từ để hoàn thành câu.
8. Sử dụng dạng thích hợp của động từ để hoàn thành câu.
9. Sử dụng dạng đúng của động từ để hoàn thành câu.
10. Sử dụng dạng thích hợp của động từ để hoàn thành câu.

Câu trả lời:
1. help
- If we recycle more, we help the earth.
2. will not dump
- Factories will not dump waste into the rivers if the government fines them heavily.
3. will be
- If people travel to work by bus, there will be fewer cars fumes.
4. do not waste
- We will save thousands of trees if we do not waste paper.
5. will have
- If we use waste water carefully, more people will have fresh water.
6. were, would you do
- If you were the president, what would you do?
7. exercise, would be
- They get sick so often. If they exercise more, they would be healthier.
8. had, would build
- If I had one million US dollars, I would build more parks in our city.
9. tidied, would not be
- Ngoc's mother is unhappy. If Ngoc tidied her room every day, her mother would not be so upset.
10. were, would grow
- There isn't a garden at our house. If there were, we would grow vegetables.

3. If people travel to work by bus, there will be fewer cars fumes, which will lead to a cleaner and healthier environment for everyone.

2. Factories will not dump waste into the rivers if the government fines them heavily, as they will be more inclined to find alternative methods of disposing waste that are environmentally friendly.

1. If we recycle more, we help protect the earth by reducing waste and preserving natural resources.

1. Home viewers can see and learn about people, places, and things in far away lands through television.
2. Yes, there are lots of kinds of entertainment on TV.
3. The writer likes contests best.
4. In some contests, TV viewers can join in and answer questions through telephone or by mail.