1. People believed that Pluto was a planet.

→ Pluto was believed to be a plannet .

2. People think that the rebels are developing weapon secretly.

→ The rebels are thought to be developing weapon secretly.                                                

3. People believe that the wanted man is living in New York.

→ The wanted man is believed to be living in New York.                                            

4. People think that fish is the oldest creature existing on earth.

→ Fish is thought to be the oldest creature existing on earth. .

5. People suppose that every film made by Cameroon is very good.

→ Every film made by Cameroon is supposed to be very good .

6. People think that many people were killed in the accident.

→ Many people are thought to have been killed in the accident. .

7. People think that the number of death in the hurricane is still rising.

→ It is thought that the number of death in the hurricane is still rising.                                                 

8. People rumor that petrol prices will increase again this week.

→ It is rumoured that petrol prices will increase again this week. .

9. People say that those dogs are very fierce.

→ Those dogs are said to be very fierce.