Despite the rising costs of many products, bus fares in the city of Zhuzhou ______ unchanged.

Living with a host family while studying abroad, in which there may be some other college students, __________ you the chance to learn more about the new culture.

(2013·杭州外国语高中模拟)It has been reported that some government leaders ________ their authority and position to get illegal profits for themselves.

--- What do people wear when they go to the theatre? --- Well, it isn’t very        . People can wear anything they like.

(2014·昆明质检)The five rings on the Olympic flag________the union of the five continents and the meeting of athletes from all over the world.