They could decide the responsible thing to do is support one party or the other.

She would do the responsible thing, but not quite yet.

I told him it was the reasonable, responsible thing to do.

"We have to decide what the responsible thing to do is," he said.

But that was the responsible thing to do,' said Maureen.

This is the only responsible thing for governments to do.

From their point of view, it was the responsible thing to do.

"The only responsible thing is to go out and test it."

That would not have been the responsible thing to do.

The responsible thing to do was to take a breath.