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: 'be focus of', Sentence: 'The Glaucoma Research Center at Wills Eye Institute focuses and coordinates these efforts to discover and disseminate sight-saving knowledge around the world .'

Answer: focuses

Question: Given Relationship: 'sit to', Sentence: 'Xena sat in silent awe as Gabrielle hopped up happily , planted a kiss on the warrior 's cheek with a resounding smack and clambered into her saddle , humming under her breath .'

Answer: into

Question: Given Relationship: 'be president of', Sentence: 'Illinois Senator Barack Obama was elected President of the United States .'

Answer:
President