irregular verbs simple past

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Across
  1. 3. understand
  2. 5. sleep
  3. 9. feed
  4. 10. take
  5. 11. become
  6. 13. write
  7. 14. forget
  8. 16. think
  9. 17. meet
  10. 18. know
Down
  1. 1. leave
  2. 2. run
  3. 4. do
  4. 5. speak
  5. 6. break
  6. 7. eat
  7. 8. drink
  8. 9. fly
  9. 11. buy
  10. 12. fight
  11. 15. throw