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。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．每处错误及修改均仅限一词；
2．只允许修改10处，多者（从第11处
Tim, I am Li Hua． This is my last year of high school, and I'll graduate this summer．I'm eighteen year old．
There is three people in my family and I'm the only one child, who is very common in Chinese families．My father work in a factory and my mother is a teacher． We lived a happy life together．
I'm cheerful boy． Besides my courses, I have much hobbies, like playing football, basketball and swimming．In the past, I collected in a lot of stamps, which are very preciously now because we seldom post a letter nowadays．I wonder if you can tell me something about myself, your family and daily school life．