此题要求改正所给短文中的错误。对标有题号的每一行做出判断，每一行均有一处错误。请按下列情况进行改正。此行多一个词：把多余的词用斜线（╲）划掉，在该行右边横线上写出该词，也并用斜线划掉。此行缺一个词：在缺词处加一个漏字符号（∧），在该行右边横线上写出该加的词。此行错一个词：在错的词下面划一横线，在该行右边横线上写出改正后的词。

At 3:42 am something began to shake. It seemed that                 66. __________

the world was in an end! Eleven kilometers directly below               67. __________

the city, the greatest earthquake of the 20^th century begin.              68. __________

It was heard in Beijing where is one hundred kilometers                  69. __________

away. One third of the nation felt. A huge crack that was                70. __________

eight kilometers long and thirty meters wide cut cross                      71. __________

houses, roads and canals. Steam burst into from holes in the               72. __________

ground. Hard hills of rocks become rivers of dirt. In                       73. __________

fifteen seconds a large city lain in ruin（废墟）. Two thirds of            74. __________

people died of or injured during the earthquake.                              75. __________