2 sentences

1. 一分耕耘一分收获，天道酬勤是自古不变的真理。

   yī fèn gēng​yún yī fèn shōu​huò, tiān​dào chóu qín shì zì​gǔ bù biàn de zhēn​lǐ.

   No pain, no gain; that God rewards the diligent is an eternal truth.

   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