Past simple - irregular verbs

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Across
  1. 4. Sing
  2. 5. Teach
  3. 6. Leave
  4. 9. Become
  5. 11. Hurt
  6. 12. Buy
  7. 15. Ring
  8. 16. Have
  9. 17. Sleep
  10. 19. Bite
  11. 20. Do
Down
  1. 1. Forget
  2. 2. Cost
  3. 3. Make
  4. 7. Fly
  5. 8. Catch
  6. 10. Fight
  7. 12. Bring
  8. 13. Hide
  9. 14. Give
  10. 17. Sit
  11. 18. Pay
  12. 19. Burn