This is the -------(good) book you can buy.填什么?

This is the _______(good) book you can buy.填什么?This is the _______(good) book you can buy.That’s the_______(difficult) question in the test.Peter jumps _______(high) and Sam jumps_______ (high) than Peter does.And John jumps _______(high) than Peter and Sam.So he jumps the _______(high) of the three.