3 sentences

1. 天一黑，就会开始放焰火了。

   tiān yī hēi, jiù huì kāi​shǐ fàng yàn​huǒ le.

   As soon as it gets dark, the fireworks will start.

   Source: Tatoeba

2. 我选了焰火。

   wǒ xuǎn le yàn​huǒ.

   I chose fireworks.

   Source: OpenSubtitles

3. 节日里，天空中燃放起五彩缤纷的焰火。

   jié​rì lǐ, tiān​kōng zhōng rán​fàng qǐ wǔ​cǎi​bīn​fēn de yàn​huǒ.

   During the festival, colorful fireworks are set off in the sky.

   Source: Dong Chinese Dictionary