Words from chapters 7 and 9

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Across
  1. 1. Head of a school (9)
  2. 4. To not pay attention to something (9)
  3. 6. A way of speaking in one part of a country (7)
  4. 7. To admit the existence of something (7 and 9)
  5. 8. Dividing line between countries (9)
  6. 11. An alternative (7)
  7. 12. To make something go faster (7)
  8. 13. To try out something to see if it works is to make an... (7)
  9. 15. Involving people and things in something (7)
  10. 16. An argument but more structured and less passionate (7 and 9)
  11. 17. When you tell people about something you make this (7)
Down
  1. 2. People who don't accept others (especially if they are different) are (9)
  2. 3. People who are citizens of a country have this (9)
  3. 5. Often (7)
  4. 9. Sure about something
  5. 10. Ten years (7)
  6. 14. When people move into a country (9)