irregular verbs

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Across
  1. 1. bought
  2. 3. thought
  3. 5. broken
  4. 6. come
  5. 8. slept
  6. 10. written
  7. 12. taught
Down
  1. 1. bitten
  2. 2. understood
  3. 4. gone
  4. 5. begun
  5. 6. caught
  6. 7. driven
  7. 8. spoken
  8. 9. swum
  9. 11. had