Correct

无以为报

/ wú yǐwéi bào / 
Strokes

Definition

unable to return the favor

Example

Definition

have nothing to give in return; be unable to make any recompense; be unable to repay a kindness

1
Duì
对
nǐ
你
de
的
hǎoyì
好意
  
,
wǒ
我
wú
无
yǐwéi
以为
bào
报
  
。

I cannot repay your kindness.