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that I shall be unable to e to your classes today owing to a bad cold. I enclose a certificate from the doctor who is attending me. He said it will be two or three days before I shall be able to resume my school. David April 20 王老師: 很抱歉,我因患重感冒今天不能到校。 史密斯 例三 (asking for business leave) Oct. 7, 200 Director Hu, A telegram has just e to hand saying that my mother is serious ill and urging me to go home at once. Because of this I should very much like to have a leave of three