3 sentences

1. 欢迎大家积极参加这次校运会。

   huān​yíng dà​jiā jī​jí cān​jiā zhè cì xiào​yùn​huì.

   Everyone is welcome to actively participate in the school sports meet.

   Source: Dong Chinese Dictionary

2. 他在校运会的田径比赛中拿到了冠军。

   tā zài xiào​yùn​huì de tián​jìng bǐ​sài zhōng ná​dào le guàn​jūn.

   He won the championship in the track and field competition at the school sports meet.

   Source: Dong Chinese Dictionary

3. 全校师生都积极投入到校运会的准备中。

   quán xiào shī​shēng dōu jī​jí tóu​rù dào xiào​yùn​huì de zhǔn​bèi zhōng.

   All teachers and students are actively involved in the preparations for the school sports meet.

   Source: Dong Chinese Dictionary