1. People know that cars pollute the environment.
→ Cars
2. People believe that the robber has worked in the bank.
→ The robber
3. Many people believe that she is an honest person.
→ It
4. They think that the president will arrive soon.
→ It
5. It is reported that many passengers died in the crash.
→ Many passengers

6. It is expected that the prices will rise again this month.
→ The prices
7. It is proved that life doesn’t exist on the moon.
→ Life
8. They say that he has passed the final exam with the best result.
→ He
9. He is said to have been in the army.
→ It
10. It is believed that the man escaped in a stolen car.
→ The man