3 sentences

1. 他在警察署工作。

   tā zài jǐng​chá shǔ gōng​zuò.

   He works at the police station.

   Source: Dong Chinese Dictionary

2. 他在申请书的末尾署了日期。

   tā zài shēn​qǐng​shū de mò​wěi shǔ le rì​qī.

   He dated the application at the end.

   Source: Dong Chinese Dictionary

3. 由于正职请假，他目前暂时代为署理馆务。

   yóu​yú zhèng​zhí qǐng​jià, tā mù​qián zàn​shí dài​wéi shǔ lǐ guǎn​wù.

   Because the head is on leave, he is currently acting in charge of the library affairs.

   Source: Dong Chinese Dictionary