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: 'report to', Sentence: 'The Director shall report to the Congress annually on the use of statutory invention registrations .'
answer:
report


question:
Given Relationship: 'join', Sentence: 'Why did Denmark join the European Union in 1973 ?'
answer:
join


question:
Given Relationship: 'be son of', Sentence: 'Seba was the son of Cush , and Sheba was Cush 's grandson .'
answer:

son