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 president of', Sentence: 'Now George W. Bush is the President of the United States .'
answer:
President


question:
Given Relationship: 'land on', Sentence: 'Phoenix - Mission to land on Mars .'
answer:
land


question:
Given Relationship: 'be celebrate in', Sentence: 'On Sunday , on their return journey , Bishop Ian Murray of the Diocese of Argyll and the Isles celebrated Mass with the group in St Columba Cathedral in Oban .'
answer:

celebrated