The Great Wall is a famous place in China. We call the Great Wall "The Ten­Thousand­Li Great Wall". It's very old. The oldest part is more than 2000 years old. It's about 6000 kilometres. It's very long. We are going to visit the Great Wall this Sunday. We should(应该) keep it clean and beautiful. Don't draw or write on it. In China，people say "He who does not go to the Great Wall is not a true man. "