3 sentences

1. 兵马未动，粮草先行。

   bīng​mǎ wèi dòng, liáng​cǎo xiān​xíng.

   Logistics must be prepared before the troops set out.

   Source: Dong Chinese Dictionary

2. 在某些重要领域，立法工作应当先行。

   zài mǒu​xiē zhòng​yào lǐng​yù, lì​fǎ gōng​zuò yīng​dāng xiān​xíng.

   In certain important fields, legislative work should take precedence.

   Source: Dong Chinese Dictionary

3. 你可以先行一步去餐厅，我办完事就过去。

   nǐ kě​yǐ xiān​xíng yī bù qù cān​tīng, wǒ bàn​wán shì jiù guò​qù.

   You can head to the restaurant first; I will join you once I finish my work.

   Source: Dong Chinese Dictionary