Stem changing verbs

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Across
  1. 3. I can 5 letters
  2. 6. he thinks 6 letters
  3. 7. They have 6 letters
  4. 8. I have 5 letters
  5. 9. they play 6 letters
  6. 12. to sleep 6 letters
  7. 14. you prefer 9 letters
  8. 15. I want 6 letters
  9. 16. we sleep 8 letters
Down
  1. 1. I sleep 6 letters
  2. 2. We have 7 letters
  3. 3. I prefer 8 letters
  4. 4. you have 6 letters
  5. 5. you play 6 letters
  6. 6. to think 6 letters
  7. 9. to play 5 letters
  8. 10. we can 7 letters
  9. 11. you want 7 letters
  10. 13. he has 5 letters
  11. 14. to be able to 5 letters