Unit 16-18 crossword puzzle

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Across
  1. 5. pollute
  2. 6. traffic jam
  3. 9. accessory
  4. 12. headquarters
  5. 13. surgeon
  6. 14. stunning
  7. 15. dawn
  8. 17. overjoyed
  9. 18. majority
Down
  1. 1. stretch
  2. 2. breathe
  3. 3. wipe
  4. 4. customs
  5. 7. apprentice
  6. 8. dairy farm
  7. 10. slum
  8. 11. wannabe
  9. 16. network