Turn from Active into Passive. Omit the agent where it can

Turn from Active into Passive. Omit the agent where it can be omitted and explain your choice.
e.g.: Van Gogh painted Sunflowers = Sunflowers were painted by Van Gogh. (emphasis on the agent) The judge has fined him 300 = He has been fined 300. (obvious agent)
1. People chop down a lot of trees every year. _______________________________________________________
2. Yesterday the police found the missing person. ____________________________________________________
3. They kill elephants for ivory. __________________________________________________________________
4. The government will introduce new measures against crime. _________________________________________
5. Someone has burgled Anns house. _____________________________________________________________
6. Steven Spielberg has directed a lot of successful films. ______________________________________________
7. They are installing a new security system in all our offices. ___________________________________________
8. When we got, we realised that someone had burgled the house.________________________________________
9. They will have elected a new government by November 30. __________________________________________
10. My wife has already paid the hotel bill. _______________________________________________________