2 sentences for 献 (xiàn — show)

1. 在联欢晚会上，他为同学们献了一首优美的歌曲。

   zài lián​huān wǎn​huì shàng, tā wèi tóng​xué men xiàn le yī shǒu yōu​měi de gē​qǔ.

   At the gala, he performed a beautiful song for his classmates.

   Source: Dong Chinese Dictionary

2. 他为了讨好上司，天天在办公室里献勤抢着干活。

   tā wèi​le tǎo​hǎo shàng​si, tiān​tiān zài bàn​gōng​shì lǐ xiàn qín qiǎng zhe gàn​huó.

   To please his boss, he tries to be helpful and eager to work in the office every day.

   Source: Dong Chinese Dictionary