3 sentences for 人口 (rén​kǒu — people)

1. 他家里人口多，开支也就大。

   tā jiā​lǐ rén​kǒu duō, kāi​zhī yě jiù dà.

   He has a large family, so the expenses are high.

   Source: Dong Chinese Dictionary

2. 他家人口多，每个月都要用很多电。

   tā jiā rén​kǒu duō, měi gè yuè dōu yào yòng hěn​duō diàn.

   He has a large family and uses a lot of electricity every month.

   Source: Dong Chinese Dictionary

3. 物资短缺时期，商店会根据每户的人口数量配售大米。

   wù​zī duǎn​quē shí​qī, shāng​diàn huì gēn​jù měi hù de rén​kǒu shù​liàng pèi​shòu dà​mǐ.

   During periods of material shortage, stores would ration rice based on the number of people in each household.

   Source: Dong Chinese Dictionary