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Across
  1. 5. - It's important to protect endangered species.
  2. 7. - Studying history helps us understand the past.
  3. 9. - Mozart composed beautiful music.
  4. 13. - The sunset was beautiful.
  5. 14. - She was certain about her decision.
  6. 15. - The old mansion was mysterious.
  7. 17. - Trust is the foundation of any relationship.
  8. 18. - Can you explain this concept?
  9. 20. - Breathing clean air is essential.
Down
  1. 1. - The president has the power to veto legislation.
  2. 2. - Please be quiet during the exam.
  3. 3. - Winning the lottery is possible.
  4. 4. - The hospital treats hundreds of patients.
  5. 6. - Let's combine these ingredients.
  6. 8. - Her goal is to become successful.
  7. 10. - Earth is the third planet from the sun.
  8. 11. - The assistant helped the students.
  9. 12. - The sun dipped below the horizon.
  10. 16. - Her stomach growled loudly during the meeting.
  11. 19. - They formulated a plan.