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.

Let me give you an example: Sentence: 'Harry glanced again at the raw looking thing that trembled and choked in the shadow beneath the distant chair.', Argument/Subject 1: 'Harry', Argument/Subject 2: 'raw looking thing'
The answer to this example can be: glance
Here is why: The sentence contains the generated relationship - glance, mentioned between two subjects - Harry and raw looking thing

OK. solve this:
Sentence: 'The Chair of the Regional Board is a member of the Executive Committee .', Argument/Subject 1: 'chair', Argument/Subject 2: 'board'
Answer:
be member of