S puzzle

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Across
  1. 1. special broadcasting service (acronym)
  2. 2. two school terms
  3. 4. metal fastener with thread
  4. 5. officer in the army
  5. 6. cartoon dog (Great Dane)
  6. 7. man who brings gifts
  7. 9. underground tank for sewage
  8. 10. turning off a computer
  9. 13. board game
  10. 14. one of the planets
  11. 15. woolly animal
  12. 16. kangaroo from TV show
  13. 17. firing a gun
  14. 19. to be kept hidden
  15. 20. secure, not dangerous
Down
  1. 1. female sibling
  2. 3. to draw or write in a hurry
  3. 4. person's or animal's bones
  4. 5. small animal with stinging tail
  5. 6. yelling
  6. 7. tool to turn screws
  7. 8. the 9th month
  8. 9. area with poor run-down houses
  9. 10. to use something with others
  10. 11. two slices of bread with filling
  11. 12. large boat
  12. 13. you can cut with these
  13. 14. identical to
  14. 15. subject at school
  15. 17. where you learn things
  16. 18. ocean
  17. 19. marine animal with flippers