instruction:
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.
question:
Given Relationship: 'be president of', Sentence: 'Tomorrow Barack Obama will become president of the United States .'
answer:
president


question:
Given Relationship: 'fire on', Sentence: 'The war began when a Confederate artillery battery fired on the Union-held Fort Sumter .'
answer:
fired


question:
Given Relationship: 'be sport of', Sentence: 'May 12 Hockey becomes Canada 's official winter sport .'
answer:

sport