题目内容：

Directions: After reading the passage below, fill in the blanks to make the passage coherent and grammatically correct. For the blanks with a given word, fill in each blank with the proper form of the given word; for the other blanks, use one word that best fits each blank.

The ancient Chinese were stonewall masters. China 1. has the world's longest fortification (buildings or walls built to defend a place), the 21,196-kilometer-long Great Wall, but the world's longest circular city wall, the Ming City Wall, which was originally 35 kilometers around. The latter stands in Jiangsu's provincial capital of Nanjing. It's one of China's most underrated tourist attractions and many local residents think it is worthy 2. (visit).

Currently, visitors can access only about three kilometers of the wall, but about 22 of the 3. (remain) 25 kilometers of the once-inaccessible wall are scheduled to open to the public soon. "In the past, the wall was the end of the city," says Sun Xiaowei, 32, president of the Nanjing-based urban hiking community. "But now it's the starting point of Nanjing's culture.” Sun recently shared with us the greatest barbican (楼堡) (an outer defensive work) 4. attracts him most: Zhonghua Gate.

5. (locate) immediately to the north of Qinhuai River, Zhonghua Gate, is one of the best preserved and most intricate barbicans in the world, according to Sun.The gate is used as a grand entrance to any tour of the City Wall.

It once served as the southern gate of ancient Nanjing, a 15,168-square-meter fortification that contained four layers of defenses, as well as three grand castles, 6. the ruins are connected to each other by a wide ring of wall. If paying an entry fee, visitors 7. view former garrisons, an exhibition about the history and variety of bricks used to build the City Wall.