Dear Mr. Zhang,
Because I have got a cold and high fever. The doctor adviced me to rest for several days. I will attend school as soon as possible. And you don't worry about my work, I will ask my classmates to help me with it once I am back.
I hope my absence will not cause you any inconvenience.
Sincerely,
Xiao Li
亲爱的张先生，
因为我有高烧。医生建议我休息几天。我将尽快去学校。而且你不担心我的工作，我会要求我的同学帮助我，一旦我回来了。
我希望我的缺席不会给你带来任何不便。
真诚，
小李
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