I want to say sorry to you because I missed the book you borrowed to me last week.I remember I put it on the book shelf after I read it Last Wednesday.Today I looked for it on the shelf,but could not find it.I asked my mother whether she placed it elsewhere when she cleaned the shelf.But she said no.I did not lent it to someone else.So it must be at my home,only we do not know where exactly it is.I will try to look for the book and tell you once I find it.Please do not worry.If I cannot find it,I will buy another book for you.