Question:
The plane shot the rocket at the target, then it hit the target.

it
Answer:
the rocket
Question:
Jill loves Jamie and she bought her a ring.

she
Answer:
Jill
Question:
Hybrid cars produce less pollution than diesel trucks because they use less gas and more electricity.

they
Answer:
Hybrid cars
Question:
The peace emissaries arrived to negotiate a peace treaty for the warring population, but they will be difficult to find common ground for.

they
Answer:

the warring population