Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
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Question: Sentence: 'Champagne refers to a Sparkling Wine from France 's Champagne region .', Argument/Subject 1: 'champagne', Argument/Subject 2: 'france'

Answer: be region of

Question: Sentence: 'It was in 1909 that William Howard Taft became the 27th president of the United States .', Argument/Subject 1: 'william howard taft', Argument/Subject 2: 'unite state'

Answer: be president of

Question: Sentence: 'Tickets may be purchased by check , cash or credit card at the Box Office during regular Box Office hours or on the evening of performance , pending availability .', Argument/Subject 1: 'ticket', Argument/Subject 2: 'box office'

Answer:
be purchase at