Get it?

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Across
  1. 2. One sheep, two..
  2. 6. One tooth, two...
  3. 7. ''Pennvässare'' in English is ''pencil...''
  4. 9. ''The president of the US is Joe...''
  5. 11. The day before yesterday
  6. 12. Capital of Russia
  7. 14. One woman, two...
  8. 15. Another word for brothers and sisters
  9. 16. Capital of Greece
  10. 17. Capital of Italy
Down
  1. 1. ''Mångfald'' in English
  2. 3. Person who speaks two languages
  3. 4. Before a concert there is usually a...
  4. 5. One famous Abba song that rhymes with ''name''
  5. 8. Another word for ''lawyer''
  6. 10. ''Mjäll'' in English
  7. 13. ''If I...you, I would call him''