One possible version：

(A)

Dear Miss Sue,

I'm sorry to tell you that I can't go to school today. I've caught a cold. Yesterday I had a headache and had a fever, so I went to see a doctor. He gave me some medicine and asked me to stay in bed for two days . and I can't go to school today. Now I'm writing to you to ask for two days' sick leave.

I hope I’ll get well and go back to school soon.

Thank you!

Yours sincerely

Sandy

(B) 

I’m sorry to hear that you have got a cold. I think you should pay more attention to your health.

First of all, it’s important to get enough sleep every day. Make sure you can sleep at least eight hours a day. And eat more vegetables and fruits instead of junk food. Junk food does harm to our body. What’s more, you should spend an hour a day doing exercise like playing basketball,playing soccer an so on.

题目分析：在做书面表达前一定要审好题。本篇书面表达要求有两方面的内容。（A）部分要求写一张请假条。写请假条时要注意，要写清楚请假的原因，请假的时间以及期限，并要附属礼貌性的感谢的话语。也要注意些请假条并非写信，虽然格式相同。请假条的特点为简明扼要。（B）部分要求的是针对Sandy请假的缘由给他几条建议。此题实质是在考查两方面内容，一方面是课本中如何保持健康。另一方面是英语中提建议的方法。

【亮点说明】（A）部分的请假条结构紧凑，内容简明扼要。准确使用了所学短语，have a cold, have a fever, have a headache, see a doctor,stay in bed for two days 等等。完全达到了请假条的写作标准。（B）部分内容层次分明。分别从作息，饮食，锻炼三个方面来表达如何保持健康。每一方面衔接自如。并且用到了提建议的表达方式。各种各样的短语句式也为文章增添了色彩。