ie or ei?

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Across
  1. 2. something that upsets you
  2. 4. a wicked person
  3. 5. proof of payment
  4. 7. look up- what do you see?
  5. 8. to accept that something is true
  6. 9. having an excessively high opinion of yourself
  7. 12. trick or lie
  8. 16. accept
  9. 17. to ease or reduce something unpleasant
  10. 18. to find or bring back something from another location
Down
  1. 1. the decorative frame around a fireplace
  2. 3. a unit of measurement for energy in food
  3. 6. something you are proud of
  4. 10. unthinkable
  5. 11. you might use this instead of a tissue
  6. 13. in a way that is misleading
  7. 14. short
  8. 15. a type of fuel