American English vs British English

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Across
  1. 4. AE spelling of "colour"
  2. 6. BE spelling of "favorite"
  3. 8. AE spelling of "practise"
  4. 11. BE spelling of "theater"
  5. 14. AE word for "city centre"
  6. 15. AE word for "trousers"
  7. 17. AE word for "pupil"
  8. 18. AE for "biscuit"
Down
  1. 1. AE word for "holiday"
  2. 2. BE spelling of "program"
  3. 3. AE for the "head teacher" of a school
  4. 5. BE spelling of "traveled"
  5. 7. AE word for "timetable"
  6. 9. BE word for German "Chips"
  7. 10. BE for "fries"
  8. 12. for "flat"
  9. 13. BE word for "soccer"
  10. 16. BE for "fall"
  11. 17. AE word for "underground"