3 sentences

1. 他愤怒地握紧了拳头。

   tā fèn​nù de wò​jǐn le quán​tou.

   He clenched his fists in anger.

   Source: Dong Chinese Dictionary

2. 上下楼梯时请握紧扶手。

   shàng​xià lóu​tī shí qǐng wò​jǐn fú​shǒu.

   Please hold the handrail firmly when going up and down the stairs.

   Source: Dong Chinese Dictionary

3. 看到精彩的进球，他兴奋地握紧了拳头。

   kàn​dào jīng​cǎi de jìn​qiú, tā xīng​fèn de wò​jǐn le quán​tou.

   Seeing the spectacular goal, he clenched his fists excitedly.

   Source: Dong Chinese Dictionary