她对自己的行为深感悔恨。

She felt ___deep regret for her actions.

当他们的儿子考试不及格时，他们感到深深的失望。

They felt ___deep disappointment when their son failed the exam.

失去工作后，他陷入了深深的抑郁。

He sank into a ___deep depression after losing his job.