irregular verbs - the past simple

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Across
  1. 5. to say
  2. 7. to bring
  3. 8. to buy
  4. 9. to understand
  5. 11. to cut
Down
  1. 1. to sleep
  2. 2. to catch
  3. 3. to speak
  4. 4. to drive
  5. 6. to think
  6. 8. to break
  7. 10. to sell