4 sentences

1. 氦气常被用来填充气球。

   hài qì cháng bèi yòng​lái tián​chōng qì​qiú.

   Helium is often used to fill balloons.

   Source: Dong Chinese Dictionary

2. 枕头里填充了柔软的羽绒。

   zhěn​tou lǐ tián​chōng le róu​ruǎn de yǔ​róng.

   The pillow is filled with soft down.

   Source: Dong Chinese Dictionary

3. 请在括号内填充正确的答案。

   qǐng zài kuò​hào nèi tián​chōng zhèng​què de dá'àn.

   Please fill in the correct answer within the parentheses.

   Source: Dong Chinese Dictionary

4. 这个故事的骨架已经构思好了，现在只需填充细节。

   zhè​gè gù​shi de gǔ​jià yǐ​jīng gòu​sī hǎo le, xiàn​zài zhǐ xū tián​chōng xì​jié.

   The framework of the story has been conceived; now it just needs the details filled in.

   Source: Dong Chinese Dictionary