【正确答案】[范文]
Dear Sir,
I've come to borrow the book Gone with the Wind, but you are away. And I can't find it in the library. I think it must have been borrowed by someone else. But I'm in great need of it, so would you please let me know as soon as possible if it is returned? My telephone number is 62468932. Thank you very much!
Yours,
Zhang Yun

【答案解析】[名师解析] 便条符合题目所要求的各个要点，开头一句便说明自己去图书馆是为了借哪本书，可是对方不在，图书馆里又找不到，因此猜想肯定是被谁借去了。但自己又亟需这本书，于是提出要求，注意，提出要求时要用礼貌的口吻would you please...。最后留下自己的电话号码便于联系。该文写得很自然流畅，用了许多地道的表达法，如be away, must have been borrowed, be in great need of sth., would you please..., as soon as等。