Except for Ronnie and ______, everyone was on time.

him****
he

Between you and ___, I know the answer to the mystery

I****
me

Leave your message with Ms. Hirioka and ______

me
I****

It was Geraldine Ferraro______ ran for vice president in 1984.

who***
whom

with _______ did you have dinner?

who
whom*****

2 answers

Between you and me. Others are correct. Between is a preposition, which takes an object, so objective case is used.
All of the others are NOT correct.

Leave your message with Ms. Hirioka and ______ ME.
With is a preposition and takes an object pronoun after it.