Please remember that instead of anybody, nobody and somebody, you may use anyone, no-one (or no one) and someone respectively.
1. something
2. Nobody (Nothing is also possible if we wish to make it more drastic.)
3. somewhere
4. Anybody
5. Nothing / Nobody (The first alternative may be better, but it depends on the context.)
6. nowhere, somewhere
7. something
8. something
9. somewhere
10. anything
11. somebody
12. anywhere
13. anything, Nobody
14. anybody
15. Somebody
16. Somebody
17. Something, something
18. somewhere
19. Anywhere
20. anybody, anybody