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: 'be member of', Sentence: 'The District Directory is usually issued to Club Presidents and Secretaries and District Committee members .'
members

Given Relationship: 'write', Sentence: 'He reminds us that Luke wrote Acts years after Paul had written his letters , so Acts should be treated ith great caution while learning about Paul !'
written

Given Relationship: 'be president of', Sentence: 'Barack Obama today becomes the first black president of the United States of America .'
president