Harry Potter and the Prisoner of Azkaban
This separation from his spellbooks had been a real problem for Harry, because his teachers at Hogwarts had given him a lot of holiday homework. (1.7)
"What are you taking Muggle Studies for?" said Ron, rolling his eyes at Harry. "You're Muggle-born! Your mum and dad are Muggles! You already know all about Muggles!"
"But it'll be fascinating to study them from the wizarding point of view," said Hermione earnestly. (4.2.19-20)
"But everyone knows that," said Hermione in a loud whisper. Professor Trelawney stared at her.
"Well, they do," said Hermione. "Everybody knows about Harry and You-Know-Who."
Harry and Ron stared at her with a mixture of amazement and admiration. They had never heard Hermione speak to a teacher like that before. (6.1.93-5)