IV. Answer the questions:
1. Can you name the main airports of London?
2. How many people pass through Heathrow each year?
3. When was the Stansted's second terminal opened?
4. Is a seismograph a man or a machine?
5. Is it possible to predict when a volcano will empt?
6. What does volcanology study?
7. Who was Marco Polo?
8. What country did Marco Polo tell the world about?

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