Riddles

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Across
  1. 3. 0 x 3,455 = ?
  2. 7. a month that can only have 29 days every four years
  3. 8. it can't be used until it is broken
  4. 9. what is black and white and read "red" all over
  5. 13. what has four legs but cannot walk
  6. 14. what has a neck but no head
  7. 16. I have teeth but cannot bite
  8. 18. it follows you everywhere you go
  9. 20. What five letter word becomes shorter when you add two letters to it?
Down
  1. 1. what you call a woman who marries a king
  2. 2. what gets wetter as it dries
  3. 4. the number of dogs equaling 12 legs
  4. 5. what kind of room has no windows or doors
  5. 6. I am full of holes but I can hold water
  6. 10. what do you call a fish that only cares about itself
  7. 11. what has three feet but no legs or arms
  8. 12. what has a face and two arms but does not talk
  9. 15. a living mousetrap
  10. 17. it teaches without talking
  11. 19. a word that everybody says wrong
  12. 21. it follows a horse wherever it goes