摘要： 单句改错增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。
删除：把多余的词用斜线(＼)划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
76. I tried t
增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。
删除：把多余的词用斜线(＼)划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
76. I tried to clean the house, but my boys got on my way.
77. The astonishing expression on his face suggested that he hadn’t expected the result either.
78. An investigation is being carried out to find how the murder happened.
79. The engine of my car was out of order on my way to work, and the rain added my helplessness.
80. We finally had the great victory at the cost of thousands of soldiers killed or taken prison.
【答案】76. on→in
77. astonishing→astonished
78. find后加out
79. added后添加to
80. killed前加being
【解析】
