Part B: 仔细阅读下面短文并按照语境完成填空(每空只能填一个单词)，注意语法，词性、词形变化等。将答案填写在答题纸上。请考生务必注意对应答题纸上相应的题号。
Below are several excerpts(节选)from the travel diary kept by Ann,one of the students from Canada.
I am representing Canada. I feel lucky to have won a place on this trip.Tomorrow we are visiting Pompeii. Next week we are flying to Loulan,in China. 48 Pompeii and Loulan became lost civilizations. The city of Pompeii was founded in the 8th century. Near the city 49 a volcano called Vesuvius.Unfortunately ,all the people were buried 50 by the volcano , and 51 was the city. When I walked around the city, I saw streets just they had been.It’s hard to imagine how this quiet volcano destroyed the city. In July, after several days of travelling we arrived in Loulan, a small,wealty commercial city which 52 between the East and the West almost 2,000 years ago.100years ago the Swedish exporer Sven Hedin discovered the ruins of the Loulan Kingdom gradually covered by sandstorms.When we went to the city, we found the ruins most interesting. There was an ancient water system 53 ran through the middle of the city. The desert was once a green land 54 enormous trees, but even that didn’t prevent the city from 55 buried by sand---what a pity!