Can you solve these riddles?

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Across
  1. 3. When you take more, you leave more behind. What are they?
  2. 7. What can you break, even if you never pick it up or touch it?
  3. 8. What has many keys but can’t open a single lock?
  4. 9. What invention lets you look right through a wall
  5. 10. What can’t talk but will reply when spoken to?
  6. 12. I’m tall when I’m young, and I’m short when I’m old. What am I?
  7. 13. The more of this there is, the less you see. What is it?
  8. 14. What starts with T, finishes with T, and has T in it?
  9. 15. What has to be broken before you can use it?
  10. 17. I am bought for dinner but never get eaten, what am I?
  11. 18. What starts with an E, but only has one letter?
Down
  1. 1. I shave every day, but my beard stays the same. What am I?
  2. 2. What is full of holes but still holds water?
  3. 4. What gets wet when drying
  4. 5. what's easy to get into but hard to get out of?
  5. 6. David’s parents have 3 sons: Snap, Crackle and…?
  6. 9. What word spells wrong in every dictionary?
  7. 11. I have no life but I can die
  8. 16. What is always in front of you but can’t be seen?