62. B）notion 63. C）before 64. B）on 65. A）proposed 66. D）evidence 67. B）original 68. A）however 69. C）effort 70. C）opposed 71. D）once 72. D）techniques 73. C）inside 74. C）lessons 75. D）enhance 76. A）convince 77. A）trouble 78. C）diligent 79. C）process 80. B）concentrate 81. D）or
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