3 sentences

1. 我的申请因为资料不全被退回了。

   wǒ de shēn​qǐng yīn​wèi zī​liào bù quán bèi tuì​huí le.

   My application was returned because of incomplete documentation.

   Source: Dong Chinese Dictionary

2. 凡是不符合要求的申请一概被退回。

   fán​shì bù fú​hé yāo​qiú de shēn​qǐng yī gài bèi tuì​huí.

   Any applications that do not meet the requirements will be rejected without exception.

   Source: Dong Chinese Dictionary

3. 由于大雪封路，我们只好退回到出发点。

   yóu​yú dà​xuě fēng​lù, wǒ​men zhǐ​hǎo tuì​huí dào chū​fā​diǎn.

   With the road blocked by heavy snow, we had no choice but to return to our starting point.

   Source: Dong Chinese Dictionary