stem changing verbs

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Across
  1. 3. - to begin
  2. 4. - to repeat
  3. 8. - to want
  4. 10. - to think
  5. 12. - to ask for
  6. 13. - to remember
  7. 14. - to sleep
  8. 16. - to prefer
  9. 17. - to be able to
  10. 18. - to return
Down
  1. 1. - to wake up
  2. 2. - to cost
  3. 5. - to play
  4. 6. - to understand
  5. 7. - to count
  6. 9. - to start
  7. 10. - to lose
  8. 11. - to feel
  9. 15. - to close