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I ______down to earth on my first Monday back to school after my holiday in Nha Trang.

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Landing on a comet was one of the most ___________ space mission in the history.

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He completed two ................ in his career as an astronaut.

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A ................ body is a natural object which is located outside of Earth’s atmosphere, such as the Moon, the Sun, an asteroid, planet, or star.

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How often do you watch the Discoveries channel on TV? - ................

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A __________is an enormous system of stars in outer space.

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Christer Fuglesang said he enjoyed floating around in the ________ environment.

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In July of 1975, the first US-Soviet joint ____________occurred with the Apollo-Soyuz project.