I don’t like to travel to big cities, because to me, one city is much like        .

 I had to buy        of these books because I didn’t know which one was the best.

Have you ever been to Mount Huangshan, _____ is famous for its towering pine forests and "sea of clouds"? 

Low-carbon lifestyle is of great benefit to improve the world environment. _______ can be enjoyed from it until you have a deep under, standing of it, however. 

 I prefer to work here because salaries are higher here than ______in my country.