Trick Questions/Riddles

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Across
  1. 2. Where are oceans with no water
  2. 5. What waves but never says hello
  3. 6. If two's company and threes a crowd, what does 4 and 5 make?
  4. 8. What can you make but never see
  5. 9. The answer is easy
  6. 12. What is the strongest birds
  7. 14. I'm so fragile that if you say my name I'll break, what am I?
  8. 15. What travels the worlds but stays in one spot
Down
  1. 1. What has three feet but can't walk
  2. 3. What is full of holes but holds liquid
  3. 4. What has four wheels and flies
  4. 7. What fills a room but takes up no space
  5. 10. What kind of dress can never be worn
  6. 11. What have one thumb and four fingers but isn't alive
  7. 13. What three-letter word sounds like a letter it does not contain?