Irregular verbs in past

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Across
  1. 2. run
  2. 3. eat
  3. 5. forget
  4. 8. up, wake up
  5. 10. give
  6. 12. teach
  7. 13. write
  8. 14. sleep
  9. 17. drink
  10. 19. sing
Down
  1. 1. go
  2. 4. think
  3. 6. take
  4. 7. buy
  5. 9. do
  6. 11. speak
  7. 15. tell
  8. 16. see
  9. 18. know