Correct

一马当先

/ yī mǎ dāng xiān /
Strokes

Definition

to take the lead

Example

Definition

gallop at the head—take the lead; be in the forefront

1
guǎn
不管
rènwu
任务
duōme
多么
jiān
艰巨
  
,
zǒngshì
总是
dāngxiān
一马当先
  
,
qiāngtiāozhòngdàn
抢挑重担
  

However difficult the task is, he is always the first to shoulder heavy responsibilities.