我最初的反应是想反对，但我重新考虑了一下。

My initial ___impulse was to disagree, but I reconsidered.

她克制住了发一封愤怒邮件的冲动，知道这于事无补。

She fought against the ___impulse to send an angry email, knowing it wouldn't help.

我一时冲动买了那条裙子，并立刻为这笔开销感到后悔。

I bought the dress on ___impulse and immediately regretted the expense.