Help, I'm stuck in neutral!

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Across
  1. 1. Shawn's family ran over a _____.
  2. 6. Shawn's dad is famous for writing _______.
  3. 10. The man who killed his son.
  4. 11. Shawn's brother. He protects Shawn from people who try to harm him.
  5. 12. Shawn likes his _____ because they make him feel free.
  6. 15. Shawn is good at _________ the things that he hears.
  7. 16. The author's last name.
  8. 18. The award Shawn's dad won for writing "Shawn".
  9. 19. The girl who is friends with Cindy that Shawn starts to like.
  10. 20. The character on Shawn's Mutant ninja Turtle cup.
  11. 21. Shawn's sister, she was there when the dog died.
Down
  1. 2. Paul used ____ to scare away the teenagers who tried to hurt Shawn.
  2. 3. Shawn's age
  3. 4. Shawn's last name is ______.
  4. 5. Shawn wishes he could tell his dad that he ____ him.
  5. 7. Who is the main character?
  6. 8. Shawn likes the feeling of ______ during his seizures.
  7. 9. Shawn and his dad are both ____.
  8. 13. Shawn's dad ______ his mom when he was younger.
  9. 14. The name of Shawn's condition.
  10. 17. Shawn's dad threw a cup at this.