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The Dutch are used to living in a country which is always exposed to dangers of deadly floods. A country with a half of its land below sea level cannot afford 61 (ignore)the problem of rising sea level, and Holland, which already has spent about U.S. $2.5 trillion (万亿)on flood 62 (prevent), plans to invest(投资)more over the next century. Life in these challenging 63 (circumstance) has inspired the Dutch to develop many excellent methods of 64 (fight)floods. Thanks to the skill of Dutch engineers, flooding in Holland is rarely widespread, and is instead limited 65 certain areas of the country. Two such areas are the valleys of the Rhine and the Meuse Rivers. In spite of large flood wall, these rivers regularly flood the surrounding areas. During dry times, however, those areas are perfectly 66 (pleasure) to live in. one solution 67 (develop)now is a type of house that seems normal in every day, except that it can float during times of high water rather than 68 (simple) sink beneath the waves as normal houses would. Groups of houses would form floating neighborhoods in 69 people could live together during times of high water, temporarily getting around by boat 70 the flood ends. 61. to ignore 62. prevention 63. circumstances 64. fighting 65. to 66. pleasant 67. is being developed 68. simply 69. which 70. till/until | 
