3 sentences

1. 他正襟危坐，神色俨然。

   tā zhèng​jīn​wēi​zuò, shén​sè yǎn​rán.

   He sat up straight with a dignified and solemn expression.

   Source: Dong Chinese Dictionary

2. 他神色慌张地跑了进来。

   tā shén​sè huāng​zhāng de pǎo le jìn​lái.

   He ran in with a panicked look on his face.

   Source: Dong Chinese Dictionary

3. 看到这一幕，他的脸上露出了惊悚的神色。

   kàn​dào zhè yī mù, tā de liǎn shàng lù​chū le jīng​sǒng de shén​sè.

   A look of horror appeared on his face when he saw this.

   Source: Dong Chinese Dictionary