Friday X-word

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Across
  1. 4. Google smartphone system
  2. 7. Long, Italian noodle
  3. 10. Famous, central Seoul mountain
  4. 11. Not right
  5. 12. Fashion for your head
  6. 14. Hours, minutes, seconds
  7. 15. The largest city in the USA
  8. 18. Red + blue = ???
  9. 19. The capital city of England
Down
  1. 1. December the 25th
  2. 2. Home of curry
  3. 3. Father of the light bulb
  4. 5. Koalas, kangaroos and wombats
  5. 6. Valentine's Day month
  6. 8. Today I go, yesterday I ????
  7. 9. The living dead
  8. 13. Birthday treat
  9. 16. Saturday and Sunday
  10. 17. Humans breathe this gas
  11. 18. This student must give me $30