Dear Mrs Brown，
My grandma suddenly fell ill last night. My parents happened to be out on business. I had to send her to hospital and look after her. I 'm writing to ask for leave of absence for three days.
I shall be very grateful if you will grant me my leave. I '11 try my best to make up my lessons missed during my absence as soon as I get back from leave.
Yours sincerely，
Lucy
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