s

p

o

i

l

e

r

1. d (for various reasons the rest won't work)
2. a
3. d
4. b
5. e (this one is really funny ;)
6. d (fits with 17)
7. d (follows from 1 and 6)
8. e (follows from the options to 7)
9. d
10. a (only one that fits with 16)
11. b
12. a (follows from 8 and there's only 20 questions)
13. d (follows from 15)
14. b
15. a (follows from 12)
16. d (follows from 10)
17. b (has to fit with 6)
18. a
19. b (nice one since you can adjust it to whatever)
20. e (obvious :)