Question:
Chuck Norris can beat any man in a fight, unless he is invincible.

he
Answer:
any man
Question:
When Sue went to Nadia's home for dinner, she caught the wrong bus and arrived late.

she
Answer:
Nadia
Question:
Jack pushed John up the hill because he is a good samaritan.

he
Answer:
Jack
Question:
Fred drove to Mack's tire shop, and he sold a tire.

he
Answer:
Mack