Prefix: cir and circum

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Across
  1. 1. Going in a circuit, circular.
  2. 3. To move in a circle or around from place to place.
  3. 4. Fill in the missing letters for _ _ _cul_r
  4. 6. Fill in the missing letters for _ir_ _s.
  5. 8. The distance around a circle.
Down
  1. 2. Fill in the missing letters for cir_ _m_en_.
  2. 3. Fill in the missing letters for _ _ _ _ _ _ nav_gat_.
  3. 5. The condition surrounding or related to an event.
  4. 7. To draw a line around.
  5. 9. Fill in the missing letters for c_rc_e.