Find the right preposition!

My younger brother is crazy surfing the net. He is also fond video games. He is a real geek!
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Are you afraid injections? Don't worry that! There is nothing to be ashamed !!!
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I'm very good History. I'm really interested learning about our past.
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This book is based a true story, isn't it? I'm addicted detective books, especially good ones!
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I'm not familiar this author but I think he is famous his eventful plots. He is brilliant depicting super heroes!
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My little brother says that he is allergic homework. He is tired doing so many exercises after school...