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: 'kill', Sentence: 'David kills the Amalekite for killing Saul , his enemy .'

Answer: kills


Question: Given Relationship: 'declare war on', Sentence: 'When the United States declared war on Germany on April 6 , 1917 , Hemingway tried to enlist in the army .'

Answer: declared


Question: Given Relationship: 'be industry in', Sentence: 'Thanks to the ever-growing popularity of elective procedures and the ever increasing costs of such procedures in the United States , the cottage industry known as medical tourism is booming .'

Answer:
industry