The Great Wall of China has a history of over two thousand years. It runs from the east to the west in North China. It is about 6,300 kilometers___36_ . It is often  37  “Ten- -thousand-Li Great Wall”. It is one of the “Seven Wonders” of the ancient world.
The Great Wall is wide enough for ten men to walk  38 . Horses can also run along it, too. The Great Wall  39  stones and bricks（砖）. There are huge stones on  40  side and on the highest part. But now some sections of it are worn out.
There are tall watch-towers alone the Great Wall. Once upon  41  time, the soldiers kept watching the enemies（敌人）in the watch-towers day and night. They made  42  on the towers to  43  each other when the enemies came.
Nowadays we don’t use the Great Wall to keep away the enemies any more. It is a famous place of interest to all the people in  44 . Every year  45  people come to visit it form all over the world.
A. wide            B. tall                 C. long
A. calling         B. call                 C. called
A. side by side    B. one by one           C. one after another
A. was made of     B. was made from       C. was made in
A. both            B. all                  C. each
A. an              B. a                    C. the
A. fire            B. a kite               C. a face
A. tell            B. talk                 C. speak
A. Asia            B. the world            C. Europe
A. thousand       B. a few thousand      C. thousands of