[解析]
1.the.考查冠词,修饰最高级,最大的运动会,故填the.
2.regular.考查形容词,on a regular basis:定期,故填regular.
3.who\that.考查连词,先行词是athletes,在定语从句中做主语,故填关系代词who/that.
4.be admitted.考查被动,被承认是参赛者,will后面填动词原形,故填be admitted.
5.but.考查连词,not only…but also:不仅,而且,故填but.
6.responsibility.考查名词,是巨大的责任,形容词修饰名词,故填responsibility.
7.to host.考查不定式,it做形式主语,真正的主语是to do不定式,故填to host.
8.as.考查连词,as…as结构,表示和…一样,故填as.
9.replaced.考查被动,已经被取代了,have been done,故填replaced.
10.Swifter.考查比较级,更快:swifter,奥运会的口号,故填swifter.