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.

Sentence: 'The current President , Dr. Peter Fong , is the Head of the Centre for Executive Development of HKU SPACE and former Executive Vice President and Professor of Asia International Open University .', Argument/Subject 1: 'president', Argument/Subject 2: 'executive'
be head of

Sentence: 'I was born and raised in Slovakia when it was still a part of Czechoslovakia .', Argument/Subject 1: 'slovakium', Argument/Subject 2: 'czechoslovakium'
be part of

Sentence: 'When Republicans regained control of the Senate , Glenn too served when the superior minority member in a favorite Senate investigatory committee chaired by Tennessee senator and actor Fred Thompson .', Argument/Subject 1: 'republican', Argument/Subject 2: 'senate'

regain control of