题目内容：

假定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。

注意：1.每处错误及其修改均限一词;

      2.只允许修改10处，多者（从第11处起）不计分。

I used to go to  countryside to draw animals and plants. One day I was walking across a field looking for rabbits to draw them. Lost in thought, I hadn’t notice a bull running towards me. About 100 metre ahead was a tree under that I would sit and draw. Sudden, I heard a noise behind me. I turned and saw the bull. Knowing a bull can run fast than a man, I quickly reached the tree but climbed up. From there I saw the bull kicking my food bag by its feet. It kept done this for 15 minutes and finally moved away.