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

they
Answer:
their members
Question:
Medics have a tough job of trying to heal the wounded since they normally have to fix them in hostile environments.

they
Answer:
Medics
Question:
The starships transported the colonists to their new planet, but they still need to transport several more waves of people.

they
Answer:
The starships
Question:
Nicole was angry at Sammie since she caught her in a lie.

she
Answer:

Sammie