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 chairman of', Sentence: 'Warner , an influential Republican and former chairman of the Senate Armed Services Committee , on Thursday recommended that Bush announce the beginning of a U.S. withdrawal in mid-September and that those troops should be back in the United States by Christmas .'

Answer: chairman


Question: Given Relationship: 'star as', Sentence: 'Another star who stumbled at the 2007 box office was Nicole Kidman , who starred in " Invasion of the Body Snatchers " remake " Invasion , " New Line 's disappointing " The Golden Compass " and Noah Baumbach 's limited arthouse release " Margot at the Wedding . "'

Answer: star


Question: Given Relationship: 'be power by', Sentence: 'Geek Practitioners Blog is powered by WordPress 2.5.1 and delivered to you in 0.999 seconds using 15 queries .'

Answer:
powered