根据短文内容，从A、B、C、D四个选项中选出一个能填入相应空格内的最佳答案。
The Great Wall in China is known to people all over the world. It 1 the Ten-Thousand-Li Great Wall in Chinese. Do you know the famous Chinese saying "He who does not reach the Great Wall is not a 2 man."?
The Great Wall is 3 wall in the world. It is more than 6,000 kilometers long, and 4four and five meters wide. In most places it is wide enough for five horses or ten men 5 side by side(并排) along the top. It was very 6 to build such a great wall without our modern machines. All the work had to 7 by hand. Many people were made 8 the wall away from their homes. Thousands of them 9 and were buried(埋葬) under the wall. The Great Wall was made not only of stone and earth, but also of the flesh and blood(血肉) of 10 men.