阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

The adobe dwellings(土坯房）___61___(build) by the Pueblo Indiansof the American Southwest are admired by even ___62___ most modern of architects and engineers. In addition to their simple beauty, what makes the adobe dwellings admirable is their __63___(able) to “air condition”a house wathout ___64__（use）exectic equipment.Walls made of adobe take in the heat from the sun on hot days and give out that hert__65___（slow）during cool nights，thus warning the house. When a new day breaks, the walls have given up their heat and arenow cold enough __66 _ (cool) the house during the hot day: __67__ the same time, theywarm up again for the night This cycle __68 __ (go) day after day: The walls warm upDuring the day and cool off during the night and thus always a timely offset（抵消）for theoutside temperatures. As __69__(nature) architects, the Pueblo Indians figured out exactly__70__thick the adobe walls needed to be to make the cycle work on most days.

语法填空

61. built

参考解析：过去分词做定语

62. the

参考解析：最高级前加the

63. ability

参考解析：their后接名词，able名词形式ability.

64. using

参考解析：介词后接动名词

65. slowly

参考解析：副词修饰动词give out.

66. to cool

参考解析：形容词加enough后接不定式。

67. at

参考解析：at the same time

68. goes

参考解析：根据上下文，此处用一般现在时态。

69. natural

参考解析：形容词做定语修饰名词。

70. how

参考解析：根据句意，应用how连接宾语从句。