-Quote #1:
"There are other ways of flying than with broomsticks."
Luna saw the solution when others didn't. That's RAVENCLAW , WITHOUT FLAW!

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"Everyone's been admiring the brooms my father brought our team."
Draco used all means at his disposal to ensure his success. That's SLYTHERIN, FOR THE WIN!

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"You take it. You should win. That's twice you've saved my neck in here."
Cedric forfeited his win for the sake of fairness. That's HUFFLEPUFF, TRUE ENOUGH!

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"I won't let you do it, I'll-I'll fight you!"
Neville up to his friends to help his house. That's GRYFFINDOR, TO THE CORE!