C. to do                         D. to doing 
80.A.types                         B. styles 
C. buildings                      D. systems 
81.A.than                          B. later 
C then                          D. latter 
82. A. Many                       B. All 
C. None                           D. Much 
83. A. key                         B. minor 
C. linking                      D. questioning 
84. A. built                        B. building 
C. to be built                   D. have built 
85. A. attract                       B. pull 
C. hold                        D. contain 
86. A. civilization                   B. culture 
C. writing                      D. book 
87. A. over                         B. for 
C. after                      D. beyond 
88. A. suffered                   B. lost 
C. invested                   D. benefited 

89. A. added                     B. divided 
C. reduced                   D. multiplied 
90. A. since                      B. before 
C. ago                       D. after 

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