奥运会裁判在比赛期间必须保持公正。

The Olympic ___judge must remain impartial during the events.

歌唱比赛的获胜者由裁判选出。

The winner of the singing competition is chosen by the ___judge.

一个好的裁判应该对规则有广泛的了解。

A good ___judge should have extensive knowledge of the rules.