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  3. When an invention is made, the inventor has three possible courses of action open to him: he can give the invention to the world

When an invention is made, the inventor has three possible courses of action open to him: he can give the invention to the world

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问题      When an invention is made, the inventor has three possible courses of action open to him: he can give the invention to the world by publishing it, keep the idea secret, or【B1】______ it.
     A granted patent is the result of a【B2】______ struck between an inventor and the state, by which the inventor gets a limited period of【B3】______ and publishes full details of his invention to the public after that period【B4】______ .
    Only in the most【B5】______ circumstances is the life span of a patent extended to alter this normal process of events.
    A patent remains【B6】______ public after it has terminated. Indeed, patent experts of- ten advise anyone wishing to avoid the high cost of【B7】______ a search through live patents that the one sure way of avoiding violation of any other inventor’s right is to steal and use a dead patent. Likewise, because publication of an idea in any other form permanently【B8】______ further patents on that idea, it is traditionally safe to take ideas from other areas of print.【B9】______
    Anyone closely involved in patents and inventions soon learns that most new ideas are, in fact, as old as the hills.【B10】______ that makes news and money. The basic patent for the theory of magnetic recording dates back to 1886.【B11】______ Even the Volkswagen rear engine car was anticipated by a 1904 patent for a cart with the horse at the rear.
【B4】
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答案terminates
解析 在专利保护的期限内，发明是严格保密的；而一旦期限结束，发明的细节就要公之于众。第四段首句中的terminated是所填词的同根词复现。主语是that period，谓语动词须用单三形式，注意词尾加s。
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