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
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Sinh Học lớp 12
