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出语言错误，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（Λ），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：在错的词下滑一横线（_），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（从第十一处起）不计分。
I firmly believe that everyone in the world loves his mother. So am I. My mother is a ordinary teacher. She always works hardly, just as other mothers do every day. In fact, she isn’t good health. She had been suffering from arthritis (关节炎) for many years. In spite of this, he never stops working or gives up hope. I still remember the day that my mother received a card of congratulation for Teachers’ Day from her director. The card was read “Thank you for your hard works; Happy Teachers’ Day to you!” At that moment, I was so moving that tears came to my eyes. I am proud of my mother.