题目内容：
根据以下材料，回答题阅读下面的短文，在空白处填人适当地单词或括号内单词的正确形式。
The Silk Road was a passage for the transportation of silk in ancient times. Lots of relics on the road can still 51_______(see)now. From the relics, tourists can see the outline of the ancient metropolitan (大都市)areas along 52_______fantastic road. In the tour packages, tourists can imagine 53_______(they)to be ancient merchants by riding camels in deserts.
The Silk Road is a long route,54_______Xi'an in the east to Gansu province and Xinjiangregion in the west. If it is your first trip to China, we 5_______(sincere)suggest you should spend at least ten days visiting Beijing, Xi'an, Dunhuang,Urumqi and Kashgar. You could get to know about the history of China and experience 56_______(color) scenery along the Silk Road.
If you are an experienced traveler 57_______(want) to explore China fully, it is recommended 58 you travel to Dunhuang, Zhangye, Jiayuguan, Turpan, Kashgar and Urumqi to follow the foot-print of Marco Polo. This route may take about 15 days. If you have only a one-week holiday, the 59_______(choose)of three most famous cities will be fit for you.
Along the Silk Road route, Xi'an and Gansu province are suitable to visit all-year round. The best time 60_______(visit)Xinjiang region is from May to October because the weather is mild.
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