The Great Wall was listed as a World Heritage by UNESCO in 1987. Just like a dragon, it winds up and down across deserts, grasslands and mountains,    1    ( run) approximately 21,196 kilometers from east to west.

The    2    ( construct) of the Great Wall was not that easy,    3    drew heavily on the local resources for building materials. The walls were    4    ( origin) built in the Spring & Autumn Period and the Warring States Period. Emperor Qin Shi Huang succeeded in his effort to have them joined together. Since then, the Great Wall    5    ( serve) as a monument 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 appealing    8    (attraction) all around the world owing to its historical significance. The best-known part 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 important impressive architectural achievements in history.