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The known are less exciting than the unknown．

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There are two men in the room; the old are the young’s father．

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There stand a lamp, a vase and some books on the desk．

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Ours are a great socialist country．

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The United Nations are made up of more than 160 countries．

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Mathematics are the base of all other sciences．

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The police has caught the murderer．

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This is one of the best novels that has appeared this year．

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A woman with two children have gone to the Great Wall．

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Each computer and each operator have been moved to the air-conditioned house．

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