1. artificial

2. unhappy

3. natural

4. convenient

5. busy, occupied

6. pleased (c)

7. meaningful

8. amazing, impressive (i)

9. typical

10. particular

11. quiet, silent (s)

12. educational

13. free (zero price) (g)

14. closed

15. awful

16. ill, sick

17. ashamed

18. bright

19. sweet

20. true

21. strange

22. stone

23. late

24. married

25. last, past (p)

26. systematic (s)

27. afraid, scared (e)

28. crowded (b)

29. scratched

30. surprised

31. elementary

32. previous (a)

33. damaged

34. square

35. terrifying

36. irresponsible

37. emotional

38. dead

39. complicated

40. mad, crazy