Prefix "in" meaning into or inside

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Across
  1. 1. Live in a place.
  2. 3. Enter a place by force.
  3. 5. Enter a place secretly.
  4. 8. Take food into your body.
  5. 9. Keep something as part of a group.
Down
  1. 2. Put medicine into the body using a needle.
  2. 4. Put something into something else.
  3. 6. Breathe air into your lungs.
  4. 7. Soak a tea bag in water to add flavour.