Irregular verbs in past participle

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Across
  1. 2. caught
  2. 4. frozen
  3. 5. found
  4. 6. flown
  5. 8. drunk
  6. 10. had
  7. 11. broken
  8. 13. done
  9. 14. said
  10. 15. gone
  11. 16. written
  12. 19. driven
  13. 20. made
Down
  1. 1. left
  2. 3. begun
  3. 5. fallen
  4. 6. forgotten
  5. 7. given
  6. 9. chosen
  7. 11. bought
  8. 12. known
  9. 14. swam
  10. 17. thought
  11. 18. been
  12. 21. eaten