《牛津》

no sweat

(informal) used to tell somebody that something is not difficult or a problem when they thank you or ask you to do something‘

Thanks for everything.’ ‘Hey, no sweat!’

with pleasure

used as a polite way of accepting or agreeing to something

‘May I sit here?’ ‘Yes, with pleasure.’

以上词典释义明显告诉我们，no sweat 用于别人感谢你或要求你做某事时说的，即那是小菜一碟的意思。with pleasure 用于礼貌地接受某物或同意某事时。

所以，这个题的答案为 No sweat.