Harry Potter and the Prisoner of Azkaban

How well do you know the book, Harry Potter and the Prisoner of Azkaban?

1 Who said this?: Never trust anything that can think for itself, if you can't see where it keeps it's brain
2 What did Ron see in Harry's teacup?
3 Which is not true about the Firebolt?
4 How did Sirius know Scabbers was Peter Pettigrew?
5 When the 3rd year Defense Against the Dark Arts class faced the Boggart, what did the boggart NOT turn into?