Crossword

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Across
  1. 5. A mix between a narwhal and horse
  2. 8. I'm easy to get into, but hard to get out of
  3. 9. The more it dries, the wetter it gets
  4. 11. This is tall when it is young, but short when it is old
  5. 12. If it eats it grows, if it drinks it dies
  6. 13. This goes through towns and over hills, but never moves
  7. 15. If two's company, and three's a crowd, what is four and five?
  8. 17. You will never see this again
  9. 18. Doctor Who's time traveling device
  10. 20. If I have this, I don't share it. If I share this, I don't have it
Down
  1. 1. This has 88 keys, but can't open any doors
  2. 2. When you add two letters to this word, it becomes shorter
  3. 3. Saying its name breaks it
  4. 4. You can catch this, but you can't throw it
  5. 5. What goes up when rain comes down?
  6. 6. Poor people have it, rich people need it, if you eat it you die
  7. 7. Which weighs more; a ton of gold, or a ton of silver?
  8. 10. Take away this word's 1st, 3rd, and last letter, and it is still the same
  9. 13. You can hear this, but you can't touch or see it
  10. 14. This goes down but never goes up
  11. 16. This gets broken without being held
  12. 19. This goes up, but never comes down
  13. 21. This has two hands but can't clap