So this took me quite a long time to answer and some I am not quite sure of but here it goes:
1. C
2. B
3. R
4. L
5. D
6. Q
7. G
8. E
9. K
10. I
11. H
12. O
13. T
14. P
15. J
16. A
17. F
18. N
19. M
20. S
Hope this helps, sorry if some are wrong!