Powergrid puzzles

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Across
  1. 5. Author of Romeo and Juliet
  2. 6. Gas essential for photosynthesis
  3. 7. The gas used in balloons
  4. 9. Founder of Microsoft
Down
  1. 1. The law stating energy cannot be created or destroyed
  2. 2. Energy source from sunlight
  3. 3. The Great Wall is located in this country
  4. 4. Founder of Buddhism
  5. 6. which sport is known as the gentleman's game
  6. 8. The longest river in the world