答案：
Dear Tom,
I’m sorry to know that you’ve got flu. Are you feeling any better now? I’m really worried about you.
In order to help you get well soon, I strongly advise you to get up early in the morning and never stay up too late. I believe a healthy lifestyle will make a big difference. Besides, you should be on a healthy diet. Don’t eat too much fat or sugar. You can try some fresh fruit or vegetables, which will be of great benefit to you. What’s more, if possible, take regular exercise or take part in outdoor activities with friends, which will surely keep you fit.
I hope you will be back with us soon.
Yours sincerely,
Li Hua
这篇书面表达是书信，并且已经给出了提示，切记不可按条回应，十分生硬没有条理。本文对于考生的综合能力要求比较高，要求考生很强的谋篇布局的能力和组织要点的能力。首先 选择自己熟悉的短语或者句型，在自己的能力范围之内，把各个要点组织成一个完整的整体， 注意作文的连贯性，做到流畅，自然。最好使用第一人称和一般现在时来写。同时也要注意使用高级词汇和高级句型使文章显得更有档次。特别注意选择句式要赋予变化。平时除了加强词汇积累，还可以适当记忆一些类似的范文，在考试中起来事半功倍的效果。
【亮点说明】本文出现一些常见短语be worried about 担心,stay up 熬夜make a difference 有影响。In order to 为了 be on a diet 节食，advise sb to do 建议某人做某事。In order to help you get well soon, I strongly advise you to get up early in the morning and never stay up too late在这个句子中出现目的状语放在句首，and连接两个并且的谓语动词且时态保持一致。You can try some fresh fruit or vegetables, which will be of great benefit to you在这个句子出现 which引导的非限制性定语从句，be of 抽象名词的结构。What’s more, if possible, take regular exercise or take part in outdoor activities with friends, which will surely keep you fit，which引导非限制性定语从句，if possible 状语从句省略。