They knew that among the most vital duties of government was to insure domestic tranquillity.

And get everybody who's not on some vital duty to come study it.

Remaining on this vital duty, she helped destroy several enemy planes.

But you are right - I do indeed have vital duties.

Afterward, the hours of the night watch were divided among our company, with considerable arguing over who would take the vital duties.

Any vital duties were carried out by prison officers.

She remained at Okinawa and engaged in this vital duty during the rest of the war.

Go now, and know you stand a vital duty.

That seemed connected to an odd sense of guilt, as though he were somehow failing in a vital duty.

We have certain vital duties to perform; to ourselves, to the outside world, and to Science.