You can't legally read all of Catching Fire for free, however if you go to The Hunger Games website, through schoolastic.com you can read the first two chapters for free.
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the way i read hunger games online for free is thay i typed "read hunger games online for free" then i picked the one that saidRead Books Online Free: The HungerGames
you can read it on onread.com. i dont know if you have to sign in to read but its free to sign in
see link
On MangaReader.com
Try http://www.hcomicbook.com/s/futa/ .Read hentai futa online for free.