My name is (your name), and I just borrowed a book called (...) on (date). Unfortunately, I lost my book. Please accept my sincere apology for this incident. I didn't expect this. Obviously, I will definitely compensate the book and pay the full cost, although I realize that this is a major cause of inconvenience. I sincerely apologize for the problems caused by my personal carelessness and my mistakes. Please understand that in the future, I will try to be more sober.

Best regards,

Your name

Enough words, hope to be adopted, I wish you high marks! ! !