A Letter Expressing Gratitude 感谢信

A Letter Expressing Gratitude
　　
July 6, 1990
　　
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.
　　
With best wishes.
　　
Yours,
　　
Sally