TASK DEFINITION: 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.
PROBLEM: Given Relationship: 'join', Sentence: 'Why did Denmark join the European Union in 1973 ?'

SOLUTION: join

PROBLEM: Given Relationship: 'be leader of', Sentence: 'The leader of the U.S. House of Representatives , Speaker Nancy Pelosi , toured Jerusalem holy sites Saturday alongside a congressional delegation that included Democratic Rep. Keith Ellison , the first Muslim elected to Congress .'

SOLUTION: leader

PROBLEM: Given Relationship: 'be city in', Sentence: 'Different excellent sight of Tuscany is Florence , the city of artifice .'

SOLUTION:
city