It is 10 that one in four children in the United States currently lives with only one parent.
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many people hurried to submit their designs of the rebuilding of London But the task of 3 the city was given to Sir Christopher Wren.
_____________(环境一旦遭到破坏),it takes many years for the system to recover
bodiless \"virtual\" communication may be less psychologically 7 than actual conversation,
They 5 that the Net would prove socially healthier than television, since the Net allows users to choose their information and to communicate with others.