阅读下面对话，掌握其大意，并根据所给字母的提示，在标有题号的横线上写出一个英语单词的完整、正确形式，使对话通顺。

Zhang Hua: How did you (1)s ________ the summer vocation this year? Wei Fang: I went to do a part-time job in Shanghai. That's really an unforgettable (2)e ________. Zhang Hua: What's your deepest impression of Shanghai? Wei Fang: It's a (3)d ________ city. There are many factories and tall(4)b__________ everywhere. The speed of development is amazing. Zhang Hua: But with the economic development, (5)________ has become a serious problem. It was (6)r _______ that billions of tons of untreated human and (7)i ________ sewage was deposited into the Yangtze River. Wei Fang: (8)T________, the government and many people have realized the importance of protecting the Yangtze River. It's our mother river, and the third (9)l ________ river in the world. Zhang Hua: It's also important for the economic development of Shanghai. Each of us should make contributions to (10)p ________ the river.

(1) __________ (2) __________ (3) __________ (4) __________ (5) __________ (6) __________ (7) __________ (8) __________ (9) __________ (10) __________