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CAE Use of English

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Read the text carefully and then decide on the best word to write in each gap. Only put one word in each gap.

The Atmosphere of 1.

Would you like to 2. an astronaut? To do this, you must travel at least 50 miles (80 kilometres) above the surface of the earth. But even after you have done that you are still 3. earth's atmosphere. Indeed, there are at least 300 miles of air still between you and the true vacuum of space.


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