Regular or irregular ?

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Across
  1. 5. meet
  2. 6. fight
  3. 9. listen
  4. 12. laugh
  5. 14. change
  6. 18. break
  7. 20. begin
  8. 21. open
  9. 23. explain
  10. 24. sleep
  11. 26. think
  12. 27. repair
  13. 29. cook
  14. 31. write
Down
  1. 1. eat
  2. 2. read
  3. 3. forget
  4. 4. become
  5. 7. give
  6. 8. travel
  7. 10. dress
  8. 11. play
  9. 13. understand
  10. 15. start
  11. 16. drink
  12. 17. go
  13. 19. buy
  14. 22. watch
  15. 25. talk
  16. 28. bring
  17. 30. know