选择恰当的单词填空。每词限用一次。（有两个多余的选项）

exactly, disappeared , hundreds, example, protect, when, longest, of, symbol, wide, northwest, build

The Great Wall of China is one of the greatest wonders of the world. With a history of more than 2,000 years, some parts of the Great Wall have 【小题1】. It is, however, still a very popular place of interest.
It is the 【小题2】wall ever built. It’s from Shanhaiguan on the east coast to Gansu Province in the 【小题3】of China. It is about 8 meters high. The top is 8 meters 【小题4】and it gets even wider towards the bottom where it is 15 meters. It is made 【小题5】stone and brick. The top is hard enough for men on horseback to ride on. The wall was built by hand and it took 【小题6】of years to finish.
No one knows 【小题7】when the building of the Great Wall was started. It is believed that the wall was built to 【小题8】parts of the country during the Zhou Dynasty. Emperor Qin Shihuang joined the separate walls built by the Qin, Yan and Zhao Kingdoms. The wall was not only for protection in the north, it was also a 【小题9】of China’s ancient civilization (文明).
Today, many of the visitors go to see the wall. 【小题10】they stand on top of a tower and look down on this wall, they can’t help (禁不住) saying “Wow, that’s fantastic!”