Opposites (or almost)

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Across
  1. 3. out
  2. 4. summer
  3. 7. sweet
  4. 11. exit
  5. 13. here
  6. 16. artificial
  7. 17. friend
  8. 18. cold
Down
  1. 1. last
  2. 2. healthy
  3. 5. expensive
  4. 6. ugly
  5. 8. decrease
  6. 9. agree
  7. 10. answer
  8. 12. poor
  9. 14. sky
  10. 15. happy