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To walk on the moon, the astronauts had to carry a suitcase ____contained oxygen.

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This reading passage is about an astronaut ___ traveled into space in 1961.

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The young astronaut has just posted a photo _____ was taken from the ISS to Twitter.

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Today, the menu on the ISS includes more than 100 items _______astronauts can choose their daily meals before they fly into space.

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Do you know the reason _______humans are interested in Mars and other planets in the solar system?

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Yuri Gagarin made the first space flight _____successfully attracted worldwide attention.

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The Astronauts Memorial Foundation honours all American astronauts __________have lost their lives on missions or in training.