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 key to', Sentence: 'As present processes are thought to explain all past events , the Uniformitarianism slogan is " the present is the key to the past . "'
answer:
key


question:
Given Relationship: 'be arrest in', Sentence: 'Selma is a city where Martin Luther King Jr. was arrested on Feb 1 , 1965 , while protesting voter registration regulations .'
answer:
arrested


question:
Given Relationship: 'declare war on', Sentence: 'When the United States declared war on Spain in 1898 , Tampa was the port of embarkation for troops headed to Cuba .'
answer:

declared