1. Which is the busiest airport in the world?

2. is the Official residence of the President of USA.

3. is the official residence of the President of France.

4. Which is the tallest building in the world?

5. Lightest metal –

6. Heaviest metal –

7. Where was the first lighthouse built?

8. Oldest republic country in the world –

9. Which animal never drinks water in its entire life?

10. Who started kindergarden system of education?

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