8 sentences

1. 他忙于公务，常常废寝忘飧。

   tā máng​yú gōng​wù, cháng​cháng fèi​qǐn wàng sūn.

   He is so busy with official business that he often neglects his sleep and meals.

   Source: Dong Chinese Dictionary

2. 他整天忙于理事，很少回家。

   tā zhěng​tiān máng​yú lǐ​shì, hěn shǎo huí​jiā.

   He is busy managing affairs all day and rarely comes home.

   Source: Dong Chinese Dictionary

3. 他一心忙于工作，无暇顾及其他。

   tā yī​xīn máng​yú gōng​zuò, wú​xiá gù​jí qí​tā.

   He is so busy with work that he has no time for anything else.

   Source: Dong Chinese Dictionary

4. 他正忙于准备报告，实在无法抽身。

   tā zhèng máng​yú zhǔn​bèi bào​gào, shí​zài wú​fǎ chōu​shēn.

   He is busy preparing a report and really cannot get away.

   Source: Dong Chinese Dictionary

5. 他整日忙于工作，连饭都顾不上吃。

   tā zhěng​rì máng​yú gōng​zuò, lián fàn dōu gù​bu​shàng chī.

   He is busy with work all day long, and sometimes even misses meals.

   Source: Dong Chinese Dictionary

6. 他终日忙于工作，很少有时间休息。

   tā zhōng​rì máng​yú gōng​zuò, hěn shǎo yǒu shí​jiān xiū​xi.

   He is busy with work all day long and has little time to rest.

   Source: Dong Chinese Dictionary

7. 他最近正忙于准备出国留学的申请材料。

   tā zuì​jìn zhèng máng​yú zhǔn​bèi chū​guó liú​xué de shēn​qǐng cái​liào.

   He is currently busy preparing application materials for studying abroad.

   Source: Dong Chinese Dictionary

8. 作者正忙于写稿，已经连续好几天没有离开过书房了。

   zuò​zhě zhèng máng​yú xiě gǎo, yǐ​jīng lián​xù hǎo​jǐ tiān méi​yǒu lí​kāi guo shū​fáng le.

   The author is busy writing and has not left the study for several consecutive days.

   Source: Dong Chinese Dictionary