英语作文：假如你叫李华,你的笔友Tom来信说他成绩不好,他很沮丧,并且你要回一封

Dear Tom:
I'm sorry to hear that.But i think you can have a good grades if you study hard.So you should do more practice about math and history.Don't play computer games on weekdays and study late if you don't feeling very tired.Be happy please,you can do it by yourself.Please write to me soon.
Yous,
Li Hua