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Across
  1. 5. Something shared by a group of people
  2. 6. Gradually
  3. 7. Ease of travelling between places
  4. 8. Something that makes life more pleasant or comfortable
  5. 9. To show or introduce something for the first time
Down
  1. 1. To make something as good as possible
  2. 2. To improve or make better
  3. 3. Process of making something more effective by introducing new things
  4. 4. How easily something can be reached or obtained