39. A. dust B. water C. grass D. bush

38. A. in time B. at first C. as usual D. for example

37. A. lucky B. awake C. calm D. strong

36. A. up B. off C. along D. down

35. A. changes B. events C. ideas D. accidents

34. A. thinking B. working C. walking D. driving

33. A. memory B. reason C. question D. purpose

32. A. action B. position C. rest D. side

31．A. cushion B. desk C. shoulder D. book

30. A. size B. shape C. weight D. strength