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.
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Question: Given Relationship: 'be chief of', Sentence: 'We work for the Chief Executive Officer also known as The President of the United States .'

Answer: Chief


Question: Given Relationship: 'be republican on', Sentence: 'Charles Grassley of Iowa , the top Republican on the Senate Finance Committee , said , " If our law officers are overlooking the E.U. 's frozen assets list , they 're missing an obvious piece of the anti-terrorism pie . "'

Answer: Republican


Question: Given Relationship: 'become', Sentence: 'Barack Obama has become the 44th President of the United States amid the highest expectations that he will renew an exhausted , confused and desperate country .'

Answer:
become