写了一篇作文,请您指导Dear Xu Hong,I,as one of your friends,am sorry to

Dear Xu Hong,
I,as one of your friends,was (听说属于过去,把 am 改为 was) sorry to hear the unfortunate news that you didn’t pass the CET-6 exam.However,as an old saying goes,“Failure is the mother of success” (直接引用一个句子应该大写),I wish you could meet the fail with confidence and courage instead of upset and depression.
As far as I know that you are superior in reading comprehension but inferior in writing.So I would like to advise you that you should enhance your English writing.And the best way to make progress in the field of writing is nothing but to take more practices (作为练习讲是可数的).
For now,please forget the past exam and cheer up.If you make constant effort (作为努力讲也是可数的,改为 make an constant effort 或者 make constant efforts) from now on,(从句在主句前应该用逗号) you would,undoubtedly,get a good score in the next exam.
Yours sincerely,
Wang Hua
语句通顺,除了有些小的缺陷外总体写得不错.