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.

Given Relationship: 'be region of', Sentence: 'Murcia is a region of Spain .'
region

Given Relationship: 'become', Sentence: 'But how did the Apostle Paul become a Christian and an Apostle ?'
become

Given Relationship: 'be build on', Sentence: 'Since the humble beginnings of HTML , many advancements have been made which allow other web languages and technologies to build on basic HTML to provide truly functional and technologically advanced websites .'

build