86. Many scientists believe that human activity has caused the g____________ warming.

85. A big fire broke out last night, as a c______________, the house was burnt to the ground.

84. Only two passengers s_________ the air-crash.

83. My job is different from anyone else’s, so my job is u__________..

根据下列句子及所给单词的首字母， 在横线上写出各单词正确的完全形式(每空限写一词)

82. He was a_________ as president of the meeting.