Using the suffix 'SION'

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Across
  1. 4. Opposite of multiplication
  2. 5. During World War II, Germany did this a lot
  3. 7. The neighbours built a big _____ on the side of their house
  4. 9. A very large, fancy house
  5. 11. Two cars crashed into each other
  6. 13. Make your mind up about something
  7. 14. Making sure everyone is involved
  8. 15. Being able to see
Down
  1. 1. Write this at the end of a science experiment
  2. 2. The bomb made a big _____
  3. 3. Making something bigger
  4. 6. Leaving something out
  5. 8. Being puzzled by something
  6. 10. The wedding was a very special _____
  7. 12. Preparing for a test