Really hard crossword

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Across
  1. 4. austrian food
  2. 5. fastest animal of the world
  3. 6. our english teacher
  4. 8. city with the most citizen
  5. 9. biggest religion in the world
  6. 10. smallest continent
  7. 12. richest person
Down
  1. 1. highest mountain
  2. 2. smallest country of the world
  3. 3. italian food
  4. 6. most sold video game of all time
  5. 7. Capital Of Austria
  6. 11. most known person in the world