Put the following into the active voice: 1. When was this radio manufacture? 2. They couldn't be found anywhere. 3. Is mathematics taught in this school?

I) put the following into the active voice:
1. When was this radio manufacture?
2. They couldn't be found anywhere
3. Is mathematics taught in this school?
4. Fortunately the machinery wasn't damaged by the accident
5. Please wait here while your luggage is being examined?
6. How are candles made ?
7. For a long time the earth was believed to be flat
8. Were you taught how to apply this theory by your teacher?
9. apples are said to be good for our health
10. Don’t let the dog be teased by the children
11. It is believed that red is the simbol of luck
12. What happen done to help the poor in this city?
13. The jewelry must have been stolen while she was out.
14. Where did the treasure use to be hidden by pirates in the old times.
II) Put the following into the passive voice:
1 -Yes-no question:
1. Do they teach English here?
2. Will you invite her to your wedding party?
3. Did the teacher give some exercises?
4. Is she going to write a poem?
5. Have they changed the window of the laboratory