Regular-Iregular verbs

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Across
  1. 3. start
  2. 5. sat
  3. 6. sank
  4. 7. call
  5. 8. wait
  6. 10. went
  7. 11. knew
  8. 13. happen
Down
  1. 1. paid
  2. 2. was/were
  3. 3. stay
  4. 4. try
  5. 7. cost
  6. 8. work
  7. 9. walk
  8. 12. fell