Class Room challenge

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Across
  1. 4. Twinkling night sky object
  2. 5. Man's best friend
  3. 6. Water from the sky
  4. 7. Writing instrument
  5. 8. Two-wheeled vehicle
  6. 10. Evergreen tree
  7. 12. Stringed instrument
  8. 13. King of the jungle
  9. 15. Green amphibian
  10. 17. White fluffy formation
  11. 18. A juicy fruit
Down
  1. 1. Plant with trunk and branches
  2. 2. Source of knowledge
  3. 3. Classroom guide
  4. 4. Morning star
  5. 7. Drawing tool
  6. 9. Our home planet
  7. 11. Night companion
  8. 14. Our country
  9. 16. Flowing water body