The long /i/ sound

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Across
  1. 2. body of land surrounded by water
  2. 4. a hard white substance that forms tusk of an elephant
  3. 6. an extinct reptile
  4. 9. To give or sell to people
  5. 10. friendly request
  6. 11. to use a knowledge or practice
  7. 12. decorative pattern
  8. 14. increase
  9. 15. an insect with colourful wings
Down
  1. 1. Quiet
  2. 3. Something that changes or hides the way one looks
  3. 5. to criticize or put to death
  4. 7. To suggest without actually saying it
  5. 8. made simple
  6. 13. a piece of bread