Creepy crossword

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Across
  1. 3. The month we celebrate Halloween
  2. 5. This animal is an upside-down sleeper
  3. 7. The ------ is a Roald Dahl book
  4. 10. I am used to create Halloween decorations (I'm also an yummy vegetable)
  5. 14. This is what keeps us upright!
  6. 16. Witches are believed to ride these
  7. 17. If we break one, we might get a cast
  8. 18. Harry Potter is one of these
Down
  1. 1. A white bedsheet makes a good costume for this character
  2. 2. A not-so-cute puppy on a fullmoon!
  3. 4. Cook up a potion in this special pot
  4. 6. ----- or treat?
  5. 8. I want to suck your blood
  6. 9. The undead
  7. 11. A scary house is a ------- house
  8. 12. Author Stephen King writes in this genre
  9. 13. Some people say this colour cat is unlucky
  10. 14. R.L ------ is the author of the Goosebumps series
  11. 15. You might say this to scare someone