Tony is Allen's classmate. One day,Tony comes to Allen's home. When he sees many books in Allen's study, he says to Allen, "Allen, you have so many good books. Can I borrow a book from you?" Allen doesn't want to lend   a book to his classmate and he says, "Why do you want to take my book home? You can read it here in my home. " Tony sees that his classmate is very selfish  , but he says nothing. The next day, Allen comes to Tony's house and says, "Tony, you have a good garden-knife. I want to work in my garden tomorrow. Can I use it for two days?" Tony answers, "Why do you want to take my garden-knife home? You can work with it in my garden. " Tony is Allen's  _
father teacher neighbor classmate