Answer:
1. se
2. me
3. se
4. nos
5. se
6. nos
7. te
8. me
9. nos (Actually, it is well said without the pronoun. But if you have to put one, this is the best option)
10. se
11. se
12. te
13. los / te / nos / me (It can be any of these options)
14. se
15. se
16. nos
17. nos
18. te
19. se