请你根据下面提示和要求，用英语写一封感谢信。
You borrowed from Mary a travel guide-book which you are now returning. Write her a letter of about 100 words thanking her for having lent it to you and telling her how useful you found it.
Hints： You have kept this book for more than six months.
You would have been lost for many times if it had not been for the guide-book.
Your name is Sally.
The date of your letter is July 6, ..
参考作文范文：
A Letter Expressing Gratitude
July 6,
Dear Mary,
I am returning you the guide-book which you lent me six months ago. I am very thankful to you, for it was a great help to me. It was with the help of this book that I was able to visit many places.
I am sure that I would have been lost many times if it had not been for this book. Besides, I learned a lot about the history of those places. Thank you again. 语文提分好帮手，易优语文题库 https://cs.euzW.net
With best wishes.
Yours,
Sally
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