Folk seem to have learned that I am the first authority upon the question.

He paused because hi&i whole future seemed to depend upon the next question.

Vincent had pondered upon the question ever since his capture.

It took a few moments for him to focus his attention upon the question.

Upon the question, which attribute is to be considered primary, opinions differ.

Upon the question being put to him, his eyes narrowed, as though he were bringing a distant view into focus.

But she could not bring her mind to bear upon the question.

Finally, I should like to touch upon the constitutional question.

But he would not think much upon the question of why he did so.

I fear that we verge close upon the question of confidentiality!