改错。
1.Each computer and each operator have been moved to the air-conditioned house.
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2.A woman with two children have gone to the Great Wall.
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3.This is one of the best novels that has appeared this year.
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4.The police has caught the murderer.
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5.Mathematics are the base of all other sciences.
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6.The United Nations are made up of more than 160 countries.
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7.Ours are a great socialist country.
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8.There stand a lamp, a vase and some books on the desk.
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9.There are two men in the room; the old are the young's father.
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10.The known are less exciting than the unknown.
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