短文改错。
假如英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共
有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏词符号（∧），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：在错的词下面划一横线，并在该词下面写出修改后的词。
注意：1、每处错误及其修改均仅限一词；
2、只允许修改10处，多着（从第11处起）不计分。
One day Mark was walking in a valley with his pet dog, Zorro. All of sudden, Mark slipped and fall to the
valley. He was so serious hurt that he lay in the stream, lost consciousness. Zorro hurried down and pulled
him out the water. As Mark was wet and cold, the dog lay on top of him, trying to keep it warm. Unluckily,
Mark was saved.
This shows clearly that animals are our good friend and we should be friendly to them. Instead of killing
or eat wild animals, we should do our best to protect them, especially these dying out.
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