此题要求改正所给短文中的错误。对标有题号的每一行作出判断：如无错误，在该行右边横线上画一个勾（√）；如有错误（每行只有一个错误），则按下列情况改正：
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加的词。
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，在错的词下划一横线，在该行右边横线上写出改正后的词。
注意：原行没有错的不要改。
The finally event in the Olympics is the                           ____ 
marathon, which name comes from a battle                          ____ 
in Ancient Greece. One of the most famous                        ____ 
marathons is in New York , watch by                             ____ 
two million people. Great Wall Marathon,                        ____ 
which most competitors find the toughest course                 ____ 
to be run. There are marathons around the                     ____ 
world today and most of people can run one                     ____ 
if you train for it. As time passes, many                      ____ 
changes have happened the marathon.                              ____