在当今经济中，长期保住一份工作很难。

In today's economy, it's hard to ___hold ___down ___a ___job for long periods.

我怀疑他靠他不靠谱的行为能保住一份工作。

I doubt he can ___hold ___down ___a ___job with his unreliable behavior.

要在这家公司保住一份工作，你需要达到严格的目标。

To ___hold ___down ___a ___job in this company, you need to meet strict targets.