I like ballons

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Across
  1. 5. a big ocean in between islands
  2. 6. there is a person breaking in
  3. 7. aliens are taking over
  4. 8. these people know what there is
Down
  1. 1. these people are confused
  2. 2. this happened not often
  3. 3. there was a massive crash
  4. 4. it was an illusion