不幸的是，我在没有完全了解情况的情况下就一头扎进了那场辩论。

Unfortunately, I had ___dived ___into the debate without being fully informed.

他决定以极大的热情投身于这个项目。

He decided to ___dive ___into the project with great enthusiasm.

她想都没想就立刻投入到手头的任务中。

Without a second thought, she ___dove ___into the task at hand.