人类首次登月是20世纪最重要的历史事件之一。

The first moon landing was one of the most important ___events in the 20th century.

学校将在下个月举办一系列文化活动。

The school will host a series of cultural ___events next month.

他在游泳比赛中获得了200米自由泳项目的冠军。

He won the 200-meter freestyle ___event in the swimming competition.