Turn the present irregular verbs into past irregular verbs

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Across
  1. 1. sung
  2. 4. took
  3. 7. wrote
  4. 10. thought
  5. 11. became
  6. 12. spoke
  7. 13. grew
  8. 14. lost
  9. 15. found
Down
  1. 1. spelt
  2. 2. went
  3. 3. ate
  4. 4. thought
  5. 5. drove
  6. 6. drank
  7. 8. sang
  8. 9. forgot
  9. 10. taught
  10. 11. built
  11. 12. swum