stem change verb memory

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Across
  1. 4. to dream
  2. 5. to repeat
  3. 10. to start
  4. 12. to have
  5. 13. to close
  6. 14. to think
  7. 17. to correct
  8. 18. to serve
  9. 19. to ask for
Down
  1. 1. to measure
  2. 2. to cost
  3. 3. to fly
  4. 6. to find
  5. 7. to count/to tell
  6. 8. to want
  7. 9. to prefer
  8. 11. to understand
  9. 15. to follow
  10. 16. to sleep