Irregular verbs

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Across
  1. 1. know
  2. 3. build
  3. 4. fly
  4. 6. fall
  5. 7. come
  6. 8. hurt
  7. 9. leave
  8. 10. burn
  9. 11. drink
  10. 13. cost
  11. 15. take
Down
  1. 2. go
  2. 3. buy
  3. 4. feel
  4. 5. write
  5. 6. feel
  6. 7. can
  7. 12. keep
  8. 14. sit