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.

Input: Consider Input: Given Relationship: 'be candidate for', Sentence: 'I believe that Barack Obama is the best candidate to succeed George W. Bush as President of the United States .'

Output: candidate

Input: Consider Input: Given Relationship: 'speak of', Sentence: 'The apostle Paul in writing to the church at Corinth speaks of the light of God shinning in our hearts .'

Output: speaks

Input: Consider Input: 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 . "'
Output: key