他更喜欢自己粉刷房子——这是出于喜爱而做的艰苦工作。

He prefers to paint the house himself - it's ___a ___labor ___of ___love.

写这部小说对作者来说是出于喜爱而做的艰苦工作。

Writing this novel is ___a ___labor ___of ___love for the author.

在动物收容所做志愿者对她来说是出于喜爱而做的艰苦工作。

Volunteering at the animal shelter is ___a ___labor ___of ___love for her.