经济危机后，这个国家的情况开始恶化。

After the economic crisis, the country's situation started to ___go ___downhill.

在决定换工作之前，他的职业生涯已经恶化了好几个月。

His career had been ___going ___downhill for months before he decided to change jobs.

如果我们不解决这些问题，这个项目将迅速恶化。

If we don't address these issues, the project will ___go ___downhill rapidly.