"We have some serious questions to answer to the American people."

These are all serious questions, which we know you will try to answer.

Serious question as I don't have any experience with this.

But there are serious questions about whether the plan will work.

So that was the kind of answer I got to a very serious question.

I think that this is a much more serious question.

It was a serious question which would need to be well talked over.

Can there be any serious question that he is right?

There are serious questions, however, about how real that potential is.

That is a very serious question and still has not, at my point of view, a perfect answer.