2 sentences

1. 他在比赛中居首位。

   tā zài bǐ​sài zhōng jū shǒu​wèi.

   He took first place in the competition.

   Source: Dong Chinese Dictionary

2. 安全应当放在首位。

   ān​quán yīng​dāng fàng zài shǒu​wèi.

   Safety should be the top priority.

   Source: Dong Chinese Dictionary