People believe that tens of thousands more live there - Tens of thousands more are believed to live there., People think that thousands of caves exist in China. - Thousands of caves are also thought toexist in China., Experts say that the Amazon rainforest comprises around 50% of the all the rainforests in the world. - The Amazon rainforest is said to comprise around 50% of the all the rainforests in the world, We know that over 2000 species of birds and mammals live there. - Over 2000 species of birds and mammals are known to live there., We know that many people died on such expeditions. - Many people are known to have died on such expeditions.,

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