题目内容：

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 Great Wall was listed as a World Heritage by UNESCO in 1987. Just like a dragon, itwinds up and down across deserts, grasslands and mountains,  1.(run) approximately21,196 kilometers from east to west.

The 2.  (construct) of the Great Wall was not that easy,  3. drew heavilyon the local resources for building materials. The walls were 4.  (original) built in theSpring ＆Autumn Period and the Warring States Period. Emperor Qin Shi Huang succeeded inhis effort to have them joined together. Since then, the Great Wall  5.(serve) as amonument of the Chinese nation throughout history.

With  6. history of about 2,700 years, some parts of the Great Wall are now 7.ruins or have disappeared. However, the Great Wall of China is still one of the most appealing8. (attraction) all around the world owing to its historical significance. The best-knownpart of the Great Wall of China, Badaling, 9.(locate) 43 miles northwest of Beijing,attracts thousands of national and foreign tourists every day.

Today, the Great Wall   10. (recognize) as one of the most impressive architecturalachievements in history.