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.

Q: Sentence: 'Bill served his country in the U.S. Navy for three years before marrying in 1961 .', Argument/Subject 1: 'bill', Argument/Subject 2: 'us navy'

A: serve in
****
Q: Sentence: 'Jesus replied that Peter would deny him three times before the roster crowed .', Argument/Subject 1: 'jesus', Argument/Subject 2: 'peter'

A: reply to
****
Q: Sentence: 'Over at SCOTUSblog , Tom Goldstein has a long post on who a Democratic president might nominate to fill the Supreme Court vacancies that would surely open up if the GOP exits the White House in 2008 .', Argument/Subject 1: 'vacancy', Argument/Subject 2: 'president'

A:
be fill by
****