Dear Mr Li
I beg to apply for two days’ leave of absence from the 7th to 8th of this week.
I’m sorry to tell you that because I was seriously ill--suffering severe headache, I want to return/go home to see the doctor. As regards the lesson to be missed during my absence, I will do my best to make them up as soon as I get back from leave.
To support my application, here I herewith/enclose the sick leave certificate.
I should be very much obliged if you will grant me my application.
Yours respectfully, Li Hua
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