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 city in', Sentence: 'Cost : customised by the event agencies that supervise City Tracks : EventMosaic in Ghent , Bruges and Ostend and Kelly Events in Antwerp and other Belgium cities .'
answer:
cities

question:
Given Relationship: 'convert to', Sentence: 'After it converts ATP to ADP , the level of the latter accumulates outside the cell and the purine can bind to a purine receptor called P2Y1 .'
answer:
converts

question:
Given Relationship: 'issue certificate of', Sentence: 'The Historical District Commission must approve the project and issue a Certificate of Appropriateness before you can apply for a building permit .'
answer:
Certificate