"ch" sounding like "k"

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Across
  1. 4. a large group of musicians
  2. 6. a group of singers
  3. 7. chemical in swimming pool water
  4. 8. a way of doing a task
  5. 13. person in a story, show, or movie
  6. 14. sad
Down
  1. 1. the place you go to learn everyday
  2. 2. a list of events in order
  3. 3. a long, green vegetable
  4. 5. holds a boat in place in the water
  5. 9. an artificial substance
  6. 10. a type of butterfly
  7. 11. a person who fixes cars
  8. 12. a holiday in December