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haha
Homo
(I'm kidding)
If you have any control over what they read, hit them with some classics:
To Kill a Mocking Bird
Lord of the Flies
A Tree Grows in Brooklyn (may be too advanced for 7th grade)
Animal Farm
Those are all books that blew me away at that age.
I've been wanting to read that Twilight series, but haven't got around to it. I've heard so many good things about it though.