Unit 9 How birds fly in the sky

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Across
  1. 3. the part of a bird's body that it uses to fly
  2. 4. 얇은, 가는
  3. 6. 부리
  4. 8. the hard part of the body under the skin
  5. 9. to leave the ground and go up into the air
  6. 11. having nothing inside
  7. 12. not heavy, easy to pick up and carry
Down
  1. 1. 비행기
  2. 2. 안에, 안으로
  3. 4. 이, 이빨
  4. 5. 땅, 지면
  5. 7. 날다
  6. 10. to move arms or wings up and down