Irregular verbs

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Across
  1. 4. fell
  2. 6. rang
  3. 7. took
  4. 9. got
  5. 11. wrote
  6. 13. woke
  7. 14. thought
  8. 17. drive
  9. 20. misunderstood
Down
  1. 1. felt
  2. 2. lost
  3. 3. understood
  4. 5. let
  5. 8. knew
  6. 10. brought
  7. 12. left
  8. 15. fought
  9. 16. begun
  10. 18. slept
  11. 19. cut
  12. 21. spoke