1. 1. a cave behind a waterfall
2. a river in a forest
3. an island in a lake
4. a mountain behind a beach
5. a volcano in the sea
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2. 1. In Europe
2. In South America
3. In Asia
4. In Africa
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3. 1. How tall is your uncle?
2. The beach is two kilometres away.
3. The swimming pool is two metres deep
4. How heavy is an African elephant?
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4. 1. Martha is taller than Jack
2. Porsches are more expensive than Skodas
3. Skiing is safer than climbing
4. I think Greek food is worse than Italian food
5. Polar bears are bigger than Lions
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5. 1. the highest
2. the deepest
3. the longest
4. the furthest
5. the most popular
6. the safest
7. the hottest