3 sentences

1. 华北平原土地肥沃。

   Huá​běi píng yuán tǔ​dì féi​wò.

   The soil of the North China Plain is fertile.

   Source: Dong Chinese Dictionary

2. 华北地区的冬天非常寒冷。

   Huá​běi dì​qū de dōng​tiān fēi​cháng hán​lěng.

   Winters in North China are very cold.

   Source: Dong Chinese Dictionary

3. 抗日战争期间，八路军在华北建立了许多根据地。

   Kàng Rì Zhàn​zhēng qī​jiān, Bā​lù​jūn zài Huá​běi jiàn​lì le xǔ​duō gēn​jù​dì.

   During the War of Resistance against Japanese Aggression, the Eighth Route Army established many base areas in North China.

   Source: Dong Chinese Dictionary