Acceleration of all fighting forces to overseas service became the imperative duty.

Now I have finished what has been a disagreeable though imperative duty.

This is its clear right, and this, too, is its imperative duty.

We have never supposed it the imperative duty of every man to vote.

All this appears to me to be matter of plain and imperative duty.

She did not understand that he was performing an imperative duty.

He considers it his imperative duty to appear 'just so,' on every occasion.

Oh, certainly, a most imperative duty; but so delicious at the same time.

It was her duty, clearly her imperative duty, yet she durst not fulfil it.

To avert it, by every human precaution, is an imperative duty with every one.

The building up of one's physical assets should be recognized as an imperative duty.

How best might she accomplish that imperative duty of rescue?

To tell her the truth was an imperative duty.

Colonization is not only a manifest expedient for, but an imperative duty on, Great Britain.

How can we perform this imperative duty to mankind?

She feels this to be an imperative duty.