In the text below some words are missing. Drag words from the box below to the appropriate place in the text. To undo an answer choice, drag the word back to the box below the text.
下面的文本缺了一些词。请把词框里的词拖到文中合适的位置；要撤销选择，把词拖回文本下方的词框即可。
Paris is very old—there has been a settlement there for at least 6000 years and its shape has been determined in by the River Seine, and in part by the edicts of France’s rulers. But the great boulevards we admire today are relatively new, and were constructed to prevent any more barricades being by the rebellious population; that work was carried out in the middle 19th century. The earlier Paris had been in part a maze of narrow streets and alleyways. But You can imagine that the work was not only highly expensive, but caused great distress among the half a million or so residents whose houses were razed, and whose neighbourhoods disappeared. What is done cannot usually be undone, especially when buildings are torn .
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