83. Nobody has any firm information, so we can only __________ on what caused the accident.
84. Cars have been banned from the city centre, which makes the area much safer for __________ .
85. There has been a real boom in __________ electronics over the last three decades.
86. When I realised that I'd left my homework at home, I quickly __________ back to get it.
87. I know it's got his name on the cover, but he used a __________ .
88. The text doesn't give you the answer explicitly - you have to __________ it from the evidence.
89. Are you having a __________ exam before you sit the actual exam in June?
90. I couldn't decide what to write about, when I suddenly __________ upon the idea of doing something on writer's block.
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