From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'begin in', Sentence: 'Team registration for Fall Adult Coed begins Monday August 4 for the leagues which will begin play September 7 at the Eagle City Road Soccer Complex .'
begin

Given Relationship: 'begin on', Sentence: 'Last Wednesday marked the beginning of Lent , the 40-day period preceding Easter when Catholics and other Christians would abstain from meat and dairy products in memory of Jesus40 days of fast and prayer before dying on the cross .'
beginning

Given Relationship: 'be authority on', Sentence: 'AIIM , the international authority on Enterprise Content Management , reveals the results of its biannual survey of current and potential end-users of ECM technologies .'

authority