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仅限一词；
2．只允许修改10处，多者(从第11处起)不计分。
One day I hurried home for lunch after school because of there would be an exam in the afternoon. I expected get back early to prepare for the exam. But when I got home, the lunches was not ready yet. I am unhappy. When the dishes were served, I found none what I liked. I ran out of the house angry, and then walking in the street for a while. When I got into the room, I saw the lunch box on my desk. One classmate told me my mother had brought them for me. Before opening the box, I found my favorite food inside. My eyes quickly filled with tears.去掉because 后的of
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(答案→)去掉because 后的of
解析：
【小题1】引导原因状语从句，用because,而because of 后加名词。
【小题2】expect to do sth. 期盼做某事
【小题3】因为后面是was，故应改为lunch。
【小题4】本短文用的是过去式，故改为was.
【小题5】none作为先行词，关系代词为that。
【小题6】angry为形容词，angrily 为副词，修饰动词。
【小题7】walked与前面的ran并列。
【小题8】前面没有提起房间，故改为a。
【小题9】it指代the lunch box，是单数。
【小题10】打开盒子后，才会发现…。