Traveling to space is no longer just a dream. China ______ the first hotel in space in the near future.

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Traveling to space is no longer just a dream. China ______ the first hotel in space in the near future.

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After traveling through two half-value layers, the incident radiation has been reduced to _____.

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The key to the industrialization of space is the U.S. space shuttle.______ it, astronauts will be able to fly into space and returning many times.

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One of the properties of light is（ ）traveling in wave form as it goes from one place to another.

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Para. 3 tells us that gardener is reluctant to leave the space since he had tears in his eyes when he said goodbye to the space plants.

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