I know this may start controversy but it's not oppressed if they don't know they're oppressed. But if being abused then let them free yes, but on the terms of being oppressed then no.
Answer:
1. forgave
2. affairs
3. enroll
4. Even if
5. improve
6. punctual
7. repaired
8. empty
9. muddy
10. hang
11. jobs
12. support
16. fined
13. harmful
14. nephew
15. fit
17.? (I'm going to guess economic)
18. materialistic
19.tolerate
20. dispose
21. biased
22. cottage
23. evidence
24. votes
25. conflict
26. diagnosis
27. events
28. pessimistic (you had that there so I'm going to assume that's the only option)
Answer:
Not entirely certain, sorry