Question:
The Autobots fight with every ounce of strength against the Decepticons, but they fight back just as hard.

they
Answer:
the Decepticons
Question:
The hippo ate the food the trainer brought when he put it in the trough.

he
Answer:
the trainer
Question:
Mark tackled the quarterback, but he was penalized.

he
Answer:
Mark
Question:
The academic clubs lost their members because they did not have free time.

they
Answer:
their members