对于一位母亲来说，保住一份全职工作可能很困难。

It can be difficult for a mother to ___hold ___down ___a full-time ___job.

我不知道我能坚持多久保住一份我不喜欢、除了钱以外什么都不能带给我的工作。

I don't know how long I'd manage to ___hold ___down ___a ___job that I don't like, and that doesn't bring me anything other than money.

在这个竞争激烈的市场中保住一份工作需要奉献精神和技能。

To ___hold ___down ___a ___job in this competitive market requires dedication and skill.