31. A. agree B. Machine C. travel D. amount 32. A. office B. exist C. person D. flower 33. A. dinner B. Engine C. morning D. believe 34. A. finish B. argue C. design D. thousand 35. A. remind B. number C. compete D. remark 36. A. nervous B. threaten C. despite D. formal 37. A. concern B. medal C. approve D. attempt 38. A. remain B. Collect C. vaccine D. against 39. A. certain B. cancer C. prevent D. million 40. A. Weather B. manage C. Moscow D. Sometimes 41. A. System B. money C . decline D. culture 42. A. Custom B. attend C. profile D. aware 43. A. Erupt B. custom C. amuse D. adopt