Change the following sentences into passive voice

1. People are destroying large areas of forest every day. →

2. The manager always welcomes new employees. →

3. Thomas Edison invented the photograph in 1877. →

4. The scientists are studying this problem carefully. →

5. People have just built many new roads in this city. →

6. The fire destroyed the forest completely. →

7. They will repair the television on next Monday. →

8. I give a gift to a girl standing next to the door. →

9. His teacher expects him to study hard. →

10. Somebody cleans the room every day. →

11. They have built a new hospital near the airport. →

12. Scientists have used many kinds of plants to treat various dangerous diseases.

→

13. People should send their complaints to the head office. →

14.The students usually hold the concerts at the university. →

15.The campers threw waste in the forest. →