72. a= if 
73. c=will
74. a= were
75. b= find out
76. c= would run
77.c= can
78. b=was not
79. b= was flooded
80. b= would
81. c= would have
82. b= if
83. d= will
84. a= study
85. b= isn't
86. a= wasn't
87. d= would occur
88. a=  studied
89. b= is bad
90. b- see