Pronoun-Antecedent Agreement

Kangaroos, koalas, and possums all have something in common:

Rafael decided to hire a quartet of singers for his birthday; _____ would have to be the best.

Jennifer likes cats. ______ is a cat person.

Aaron loved going to the harbor when _____ full of boats.

The astronaut's suit was too warm for him, but _______ kept walking towards the rocket ship.

Sanchit and I love playing Enchanted Hollow; it's one of ______ favorite board games.

Adrienne likes going to baseball games because ______ loves the energy of a live sporting event