我试图解释情况，但他就是改变了话题。

I'd tried to explain the situation, but he just ___changed ___the ___subject.

好吧，换个话题，我不小心打碎了你漂亮的花瓶。

Well, ___changing ___the ___subject, I accidentally broke your beautiful vase.

当谈话变得尴尬时，她迅速改变了话题。

When the conversation became awkward, she quickly ___changed ___the ___subject.