Cloze.注意大小写和词尾变化！！！    The Silk Road is a perfect example of    1    in the ancient times. It was called the Silk Road because during the 1st century BC, when silk was introduced to the     2   Empire, it became extremely popular. It was one of the early   3     in the development of trading routes from Europe to the Far East.    Zhang Qian is considered to be the   4    of the silk road. During the reign of    5   , Zhang Qian led a diplomatic mission to the Western Regions and opened up the first route from China to the West. Later, monks from China went to India to bring back    6    . Xuan Zang was one of them.     The Silk Road is not a single road, but a network of routes covering a vast area across the (  7   ) continent. Aside from the overland silk road, there were also    8   routes, which were used mostly for the transportation of   9    through the sea.     Today, the   10    proposed by Chinese President Xi Jingping in 2013 marks the revival of the ancient Silk Road.