【正确答案】Dear Mr. Liu
21, Jan. 2006
I'm Zhang Chen, Zhang Wei's father. I'm writing to ask for permission for Zhang Wei's leave of two days. His mother is lying up owing to a serious traffic accident. What a coincidence! I will go to Tian Jin on urgent business trip and our relatives are all fully occupied So Zhang Wei has to stay at home to take care of his mother who can't leave bed. I can assure you that Zhang Wei will be back as soon as I finish my job.
Thank you.
Zhang Chen