Flexibility

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Across
  1. 3. fast
  2. 5. not closed
  3. 9. keen and quick to deal with requests
  4. 11. very fast section of river
  5. 12. having lots to do
  6. 14. wide awake, attentive
  7. 15. not a passenger
  8. 16. affirmative
Down
  1. 1. moves quickly and lightly
  2. 2. clever, canny
  3. 4. optimistic
  4. 6. highly active and full of movement
  5. 7. liquid or gas, flows easily
  6. 8. invent something new or make changes
  7. 10. Bends easily without breaking
  8. 13. well dressed