1 sentence

1. 他在送给朋友的贺卡上工整地写下了“生日快乐”。

   tā zài sòng​gěi péng​you de hè​kǎ shàng gōng​zhěng de xiě​xià le“ shēng​rì​kuài​lè”.

   He neatly wrote "Happy Birthday" on the greeting card for his friend.

   Source: Dong Chinese Dictionary