4 sentences

1. 民权运动在二十世纪六十年代非常活跃。

   mín​quán yùn​dòng zài èr​shí shì​jì liù​shí​nián​dài fēi​cháng huó​yuè.

   The civil rights movement was very active in the 1960s.

   Source: Dong Chinese Dictionary

2. 这本小说描写了二十世纪初的社会变革。

   zhè běn xiǎo​shuō miáo​xiě le èr​shí shì​jì chū de shè​huì biàn​gé.

   This novel describes the social changes at the beginning of the twentieth century.

   Source: Dong Chinese Dictionary

3. 他被公认为二十世纪最伟大的政治家之一。

   tā bèi gōng​rèn wéi èr​shí shì​jì zuì wěi​dà de zhèng​zhì​jiā zhī yī.

   He is recognized as one of the greatest statesmen of the twentieth century.

   Source: Dong Chinese Dictionary

4. 在二十世纪五十年代，这里曾是一个行政专区。

   zài èr​shí shì​jì wǔ​shí nián​dài, zhè​lǐ céng shì yī gè xíng​zhèng zhuān​qū.

   In the 1950s, this was an administrative prefecture.

   Source: Dong Chinese Dictionary