1. certain

2. fragile

3. best

4. exhausting (f)

5. electric

6. destroyed

7. short

8. good, fine (-n)

9. wrong, incorrect (f)

10. sudden

11. extra

12. afraid, scared (p)

13. lower

14. dead

15. sour

16. slippery

17. pink

18. natural

19. stone

20. little, small

21. complete

22. true

23. unexpected

24. entire, whole (t)

25. last, past (d)

26. systematic (s)

27. upper

28. free (zero price) (g)

29. modest

30. immediate

31. unknown

32. unhappy

33. another, other

34. plastic

35. shy

36. amazing, impressive (e)

37. sunny

38. responsible

39. clear

40. boring