Past tense word puzzle

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Across
  1. 3. is
  2. 5. sing
  3. 9. disappear
  4. 11. hit
  5. 12. walk
  6. 14. follow
  7. 16. have
  8. 17. run
Down
  1. 1. ask
  2. 2. cry
  3. 4. know
  4. 5. sit
  5. 6. see
  6. 7. think
  7. 8. fall
  8. 10. say
  9. 13. look
  10. 15. go