People call these strange objects Unidentified Flying Objects（UFO）.

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After the publication of two most famous papers（论文）, there was not a major university in the world that would not have been glad to have him work for them.

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One day we may even learn more about the invisible colors around us.

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CBS was organized in 1928 when its founder, William Paley asked for ownership of a group of radio station.

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He turned off the light, ______ nothing.

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I as well as many students ______ fond of music.

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We should ______ the customs of the countries we are visiting.

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Tom is to be in _______ with his partner on the point.

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The _____ news made them _____.

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______ the door, I let the stranger come in.

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