Question:
Medics have a tough job of trying to heal the wounded because they are normally hurt in dangerous scenarios.

they
Answer:
the wounded
Question:
The lion bit the gazelle because it had sharp teeth.

it
Answer:
The lion
Question:
Knights preferred dragons over horses because they could not fly.

they
Answer:
horses
Question:
Michael backed Bill because John really liked him.

him
Answer:
Bill