Dear Ms.Riddle，
I would like to know if I could ask for a casual leave of absence from your Oral English class this Wednesday morning.
Yesterday evening I got a phone call from my cousin, who is now running a small firm in suburbs of this city . He needs an interpreter for two days but cannot find the most reliable person， so he wants me to have a try. Personally ， I regard this as a golden opportunity to put what I have learned in your class into practice， but I need your permission of absence . If you think I may go and help him get over the difficulty， I am confident that I ll do a good job and both of us will grateful.
Earnestly yours，
Sam
Director Hu,
A telegram has just come 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 days beginning on Oct. 8. I hope that my request will be given due consideration.
Chen Xingxing
Encl: a telegram from my home
Sept.20
Dear Miss Lu，
I'm sorry I can't go to school today. I played football with my classmates yesterday. Unluckily, I fell off and hurt my leg, but I wasn't badly hurt. The doctor asked me to stay in bed and have a good rest. So I ask for leave for two days.
Many thanks. I'm looking forward to your kind answer.
Wang Lei