The secret of happiness is to treasure the things you have now. But someone won’t know it _______ they lost what they own.

A. if B. while C. since D. until

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Fewer and fewer people spend time reading. There were only 49% of adults in the US ________ visited a public library last year.

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How to protect children Web fans from unsuitable materials on-line while encouraging them to use the Internet has long been discussed in the U.S.

For some parents, the Internet can seem like a jungle, filled with danger for their children. But jungles contain(包含) wonders as well as danger and with good guides, some education, and a few precautions(預防措施), the wilds of the Internet can be safely navigated(領(lǐng)航). “Kids have to be on-line. If we tell our kids they can’t have chance to the Internet, we’re cutting them off from their future.” said an expert.

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