"We are here to see General H'druhn on a matter of the gravest urgency."

"Please beg His Excellency's indulgence and request an immediate interview on a matter of grave urgency."

'What is it you wanted to discuss with me and no one else, this matter of grave urgency?'

'Our mission is of the gravest urgency, but this matter overshadows even that.'

"Matters of grave urgency make it advisable that discussion be opened between a representative of the UN forces and themselves."

'Joe, thank God,' said Chelsea, with an air of grave urgency.

We must needs take council with him in matters of gravest urgency.

A matter of gravest urgency has reared its head.

On the budget and trade deficits, he added: "This is a matter of grave urgency.

"I've just managed to land here, via the Prometheus, on a matter of gravest urgency," he began.