Viết câu bị động (viết cả 2 cách nếu có thể)

Bài 2: Viết câu bị động (viết cả 2 cách nếu có thể)

1. They have recycled plastic waste in the factory for 15 years.

2. People think he solved the problem effectively.

3. I hear him deliver the speech from the beginning.

4. Nam had the teacher teach the lesson again.

5. We need to protect the environment for a green world.

6. Factories and vehicles have emitted a lot of smoke.

7. They suppose she is a murderer because of her attitude.

8. I will get the company to postpone the flight next month.

9. Jack noticed his father leave home.

10. We need to improve our speaking skills to communicate with foreigner.