他完全沉浸在手头的事情里，连铃声都没听见。

He was so ___engrossed in what he was doing that he didn't hear the bell.

学生们完全沉浸在书本中，没有注意到时间。

The students were completely ___engrossed in their books and didn't notice the time.

我完全沉浸在这本小说里，一口气把它读完了。

I became so ___engrossed in the novel that I finished it in one sitting.