Children who skip breakfast often don't concentrate as we as others 9 reference. mention refer to reference book: for further reference reference to: with reference to= concerning: about e.g.--It was strange that he made no reference to any work experience in his resume With reference to your recent letter. Im instructed to inform you that we cannot accept the offer 10.urge: urge sb to do sth. / into doing sth urge that-clause-Children who skip breakfast often don’t concentrate as well as others. 9.reference: mention refer to reference book; for further reference reference to : with reference to = concerning; about e.g.-- It was strange that he made no reference to any work experience in his resume. -- With reference to your recent letter, I’m instructed to inform you that we cannot accept the offer. 10.urge: urge sb. to do sth. / into doing sth. urge that -clause