Christmas time

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Across
  1. 1. That's white and it falls from the sky
  2. 4. In winter, it's covered by a blanket of snow
  3. 6. Santa's best friend
  4. 7. We put it at home when it's Christmas
Down
  1. 2. That's cold and invisible
  2. 3. The opposite from hot
  3. 5. We eat it in New Year's night