Lets find the long " i " words through the clue given.

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Across
  1. 2. paper bird flies in the sky
  2. 4. opposite of day
  3. 6. expression of happiness
  4. 7. journey through the air
Down
  1. 1. insect with colourful wings
  2. 3. organising things
  3. 5. opposite of low