按要求写英语作文.假如你是刚刚,进入高中后一直想买一个mp3,但是父母反对.请你根据下列信息,给妈妈写一封信,说服她满足

Dear Mother,
I still want to talk about mp3 for which I have been longing for a long time. You know it's very helpful for a high school student. I can record Chinese and English lessens and listen them off class. And sometimes I need relax myself from hard work by listening some music. And mother, I promise you that I only use it for study, and relax when I'm tired and before going to bed. Please do me a favor, mother, and in return I will do more housework on weekends.
Your son (daughter)