initial

我的最初反应是愤怒。

My ___initial reaction was one of anger.

他忘记了使他选择这条道路的最初冲动。

He forgot the ___initial impulse that made him choose this path.

Paul M. Reynolds拒绝说出首字母'M'代表什么。

Paul M. Reynolds refused to say what the ___initial "M" stood for.