【正确答案】[范文] Dear William, I am terribly sorry to tell you that! have lost the valuable book you were so kind to lend me last week. I read it everyday and intended to finish it next month. Last night when I came to my room, it was nowhere to be found. I will try to recover it as soon as possible. If I fail to find it, I will buy a new one for you. But I am afraid it can never take the place of the old one. And for this irrecoverable loss, I am to blame, for I was so careless with my things. This is a warning to me to be more careful in the future. Yours sincerely, Li Ming