My list word crossword

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Across
  1. 5. mathematics in which letters and other signs
  2. 6. A main branch of a tree
  3. 8. to cooperate with someone
  4. 13. lacking restraint in spending money/using items
  5. 16. Betrayal of trust
  6. 17. a solid figure with ten plane faces
  7. 18. A short version of a long word/words
Down
  1. 1. gasping for breath, typically due to exertion
  2. 2. Try hard to do or achieve something
  3. 3. the public knowledge of something
  4. 4. basic thing before hard thing
  5. 7. A decorative ribbon tied in a bow
  6. 9. A large long-tailed game bird native to Asia
  7. 10. a beauty contest
  8. 11. an educational talk to an audience
  9. 12. differentiating between two or more people
  10. 14. not complete
  11. 15. something that is special