The Great Wall of China is a series of walls which took many hundreds of year to build. It is the [?] (impressive) defensive structure ever built to protect the land from invading foreigners. It is the [?] (long) wall in the world, measuring 6,352 km. The workers building the wall had one of the [?] (dangerous) jobs as they were attacked by the [?] (terrifying) bandits. Today it is one of the [?] (popular) tourist attractions in China.
You can climb up the wall and walk along it. The [?] ( good) preserved areas are near tourist centers, while in some sections the wall has fallen into ruin. Over the years the wall served as one of the [?] (useful) sources of building material for the nearby villagers. They took the stones to build their houses. One of the [?] (difficult) questions about the wall is whether it can been seen from outer space. But the [?] (authoritative) sources agree that it is not possible to see it from space. There is a saying in Chinese that "you're not a real man if you haven't climbed the Great Wall". Perphaps it should be called the [?] (great) Wall.