她为慈善机构做了很多无偿工作。

She does a lot of ___unpaid work for the charity.

那时他主要在做无偿工作，靠低预算生活，并去上绘画夜校。

At the time he was mostly doing ___unpaid work, living on a low budget and going to painting night-classes.

许多实习生接受无偿职位以获得经验。

Many interns accept ___unpaid positions to gain experience.