写一篇50-60词的英语小便条 TO THE CHIEF LIBRARIAN ABOUT THE LOSS OF A B

Dear Sir,
I am sorry to say I have lost the book I borrowed from our library last week.I know this is a big
mistake,but I must make some explanation.
Yesterday I went to one of the classrooms in our main building to study.After reading for an hour or so,I went out to answer a phone call at about ten and I just left the book on the desk.
When I came back,however,I found the book was not on the desk.Although I aske a neighbor about it,he just told me he hadn't notice anything.
I know losing the borrowed book is my fault and I will accept any punishment from our library.
I must say sorry again and I am willing to make the compensation for it.
A depressed student