81. [A] unalike
[B] unaware
[C] unlikely
[D] unknown
82. [A] concludes
[B] excludes
[C] dissolves
[D] involves
83. [A] explosion
[B] exposure
[C] extension
[D] expansion
84. [A] endangered
[B] inspired
[C] harmful
[D] frustrated
85. [A] established
[B] created
[C] constructed
[D] built
86. [A] isolate
[B] apart
[C] refrain
[D] remove
[B] unaware
[C] unlikely
[D] unknown
82. [A] concludes
[B] excludes
[C] dissolves
[D] involves
83. [A] explosion
[B] exposure
[C] extension
[D] expansion
84. [A] endangered
[B] inspired
[C] harmful
[D] frustrated
85. [A] established
[B] created
[C] constructed
[D] built
86. [A] isolate
[B] apart
[C] refrain
[D] remove
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