commonly confused words

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Across
  1. 3. simple
  2. 4. flying vehicle
  3. 6. quiet order and security
  4. 7. writing paper
  5. 11. at the time
  6. 13. place
  7. 15. possessive form of they
  8. 17. without noise
Down
  1. 1. rule of conduct
  2. 2. a fixed position
  3. 5. gleamed
  4. 6. a part of something
  5. 8. used in a comparison
  6. 9. beyond
  7. 10. revealed
  8. 12. hurled
  9. 13. attentive of accuracy
  10. 14. head of school
  11. 15. contraction of they are
  12. 16. a great extent