Irregular verbs in past participle

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Across
  1. 1. bought
  2. 2. bitten
  3. 3. done
  4. 4. bent
  5. 7. brought
  6. 9. fallen
  7. 10. dug
  8. 11. chosen
  9. 13. cost
  10. 14. bet
  11. 15. broken
  12. 16. drawn
  13. 17. driven
  14. 18. blown
Down
  1. 1. become
  2. 2. been
  3. 5. drunk
  4. 6. cut
  5. 7. built
  6. 8. caught
  7. 11. come
  8. 12. eaten
  9. 14. bled
  10. 15. begun
  11. 16. dealt