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: 'Nazi Germany 's attack on the Soviet Union in June 1941 extended the zone of killing operations even farther east .', Argument/Subject 1: 'germany', Argument/Subject 2: 'soviet union'

Answer: attack


Question: Sentence: 'Mozambique is a country in Africa .', Argument/Subject 1: 'mozambique', Argument/Subject 2: 'africa'

Answer: be country in


Question: Sentence: 'Vacancies Any vacancy on the Board of Directors may be filled by the Board of Directors for the remainder of the vacated term .', Argument/Subject 1: 'vacancy', Argument/Subject 2: 'board'

Answer:
be fill by