Fun crossword, but the clues are riddles.

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Across
  1. 4. I follow you all the time and copy your every move, but you can’t touch me or catch me. What am I?
  2. 5. What is black when it’s clean and white when it’s dirty?
  3. 7. What has a bed, but never sleeps?
  4. 8. It belongs to you, but other people use it more than you do. What is it?
  5. 10. What is lost but not returned?
  6. 11. I’m tall when I’m young, and I’m short when I’m old. What am I?
  7. 12. If you’re running in a race and you pass the person in second place, what place are you in?
  8. 17. What building has the most stories?
  9. 18. What kind of band never plays music?
  10. 19. What invention lets you look right through a wall?
  11. 20. What is full of holes but still holds water?
Down
  1. 1. What has many keys but can’t open a single lock?
  2. 2. I open and close but I’m not a book. What am I?
  3. 3. What goes up and down but doesn’t move?
  4. 5. What has a head and a tail but no body?
  5. 6. The more of this there is, the less you see. What is it?
  6. 9. What can’t talk but will reply when spoken to?
  7. 13. What can you catch, but not throw?
  8. 14. I have legs but cannot walk. what am I?
  9. 15. What goes up but never comes down?
  10. 16. What can you break, even if you never pick it up or touch it?