Oh, I'm afraid most of them have been overdue for several days ... Oh, this one has been overdue for two months!
Oh, my God! I didn't expect this. I should have applied for an extension.
You'd better make a reading list. Don't blindly take a stack of books from the shelf. You should ask the librarian for help.
A: Well ... now I want Les Miserables.
B: You need to make a reservation, sir. Now show me your library card.