Irrebular verbs

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Across
  1. 4. - knew
  2. 8. - swam
  3. 11. - wrote
  4. 13. - burnt
  5. 14. - sent
  6. 17. se - stood
  7. 18. - bought
  8. 19. - broke
Down
  1. 1. - took
  2. 2. - sat
  3. 3. - drove
  4. 5. - hit
  5. 6. - rang
  6. 7. se - became
  7. 9. - won
  8. 10. - grew
  9. 12. - heard
  10. 15. - understood
  11. 16. - paid