69.B simply
70.A vital
71.C too
72.A benefits
73.D outside
74.C Exposure
75.B less
76.C analysis
77.C necessarily
78.C approved
79.B always
80.A advantage
81.D grateful
翻译部分：
82. Their only son has never thought
83. weigh your decision against its possible consequences.
84. would he break his commitment to pay back the money.
85. should not be addicted to computer games.
86. never considered working as a salesman.