Irregular verbs

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Across
  1. 1. see
  2. 4. sell
  3. 6. teach
  4. 7. understand
  5. 9. sing
  6. 11. stand
  7. 12. throw
  8. 14. win
  9. 15. take
  10. 17. steal
  11. 18. wear
Down
  1. 1. sit
  2. 2. sleep
  3. 3. think
  4. 5. tell
  5. 8. send
  6. 9. spend
  7. 10. wake
  8. 11. speak
  9. 13. write
  10. 16. swim