借书书信英语作文

Dear Kate,
　　How are you been doing recently? I am writing this letter to ask you to borrow a book from you.
　　The book I want to borrow is The composition of American Higher education Investment. It has a green face. Professor Li has mentioned it at his last class. It is necessary for my new paper. You may  also need it , so I will return it  before next week.
　　I would like to express my gratitude to you for your kind help.Please reply me whether I can borrow it at your earlist convenience.
　　Your sincerely,
　　Li Ming