裁判吹响了他的哨子来结束比赛。

The referee blew his ___whistle to end the game.

我太紧张了，一直在想那声尖叫和那些哨子声，所以我决定出去看看。

I was so nervous and I was thinking about that scream and those ___whistles, so I decided to go outside to have a look.

他用哨子来发令比赛开始。

He used a ___whistle to signal the start of the race.