ubah kedalam kalimat pasif, semampunya aja kak

1. a bad smell is produced by a skunk to protect itself.
2. that work wasn't done by alice again.
3. a lot of stamps have been collected by Sam.
4. what is being visited by them now?
5. the high mountain would be climbed up by them.
6. whom is your exercise book taken by?
7. is the heavy box bought by ane old lady?
8. the soup ingredient has been mixed by her.
9. a present was given to me (by somebody). atau I was given a present (by somebody).
10. a newspaper is being read by my brother.