Dưới đây là đáp án cho các câu hỏi trong đoạn văn:

1. **How are the seas and rivers nowadays?**
**Đáp án:** A. are contaminated

2. **What do traffic policemen have to do, in one well-known city?**
**Đáp án:** C. They have to wear oxygen masks.

3. **Why do farmers in parts of Africa and Asia not grow enough to eat?**
**Đáp án:** A. Because people cut down many trees.

4. **Wild animals are:**
**Đáp án:** D. in danger from extinction.

5. **What's the best title for the passage?**
**Đáp án:** C. Save the Earth.

### Viết lại câu:

1. **Let's build more green schools in Viet Nam.**
We should build more green schools in Viet Nam.

2. **My mother can cook better than I can.**
I can't cook as well as my mother.

3. **I won’t do anything if you don’t answer my question.**
Unless you answer my question, I won’t do anything.

4. **Did you love listening to country music?**
Were you fond of listening to country music?

5. **I won’t return my book to the library. I’ll finish my research project first.**
Until I finish my research project, I won't return my book to the library.

### Sắp xếp lại các từ/cụm từ:

1. **Which famous country is spaghetti from?**
2. **You might find their traditional lifestyle interesting in Alaska.**
3. **Many teenagers enjoy volunteering during remote work.**
4. **Unless you go out and finish your homework, your friend can’t.**

Hy vọng các đáp án trên hữu ích cho bạn!