Correct

一力

/ yī lì / 
Strokes

Example

As an Adverb

to the best of one's ability

1
Yīlì
一力
dāngxiān
当先

try one's utmost to be ahead of others

2
Yīlì
一力
chéngquán
成全

do one's best/do all one can to help sb (to achieve his aim)