Turn these sentence into pasive voice: They must feed the dogs. We've just given him some beef. Children often eat sweets. They always make children work hard

turn these sentence into pasive voice 
1. They must feed the dogs.
> Dogs...
> Mo..
> Some flowers...
2. We 've just given him some beef.
>He
>Some beef
3. Children often eat sweets.
>sweets
4. They always make children work hard.
>Children
5. Hung might find another job in this city.
>Another
6. They said that she is a doctor.
>It
>She
7. They said that Nam died.
>It
>Nam
8. People thought that Peter killed himself.
>It Peter
>Peter
9. People said that he stole my bike.
>It
>He
10. They said that she will go to the zoo
>It
>She
11. People said that she will go to the zoo
>It
>People 
12. They said that she killed Hung
>It
>She