Dear Mr/Ms ,
Today Im writing to you to ask for a five-day leave， for Ive got cold last night with carlessness.
This morning my mother took me to see the doctor，who told me to stay in bed for some days. So I am very sorry to be absent from school， especially your interesting lessons. Ill be sure to make up for the missed lessons after I recover from the illness.
Yours sincerely，
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