The dash should be placed after "things".
Nowhere else in the sentence makes sense, and there is an abrupt change with no pause.
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You can't you need to show your text to compare them
Emotion. Fear is a feeling that, while can be fueled by logic, is still in itself an emotion. When you target a persons fear you are using their emotions.
Uncut books usually indicate that no one has used them, implying that Gatsby merely had the books to display his wealth. Although this is ostentatious, Gatsby had a reason to impress (I don't know if you finished the novel, so I don't want to continue with spoilers.)
Answer:
Happy, as the younger son, has grown in Biff's shadow. He feels a deep-seated need to prove himself to his father. Hence, he won't go west until he can achieve his father approval.