Problem: How does the sentence end?

The class took an exam in the classroom instead of a quiz since the
Answer: quiz was later.

Problem: How does the sentence end?

The athlete felt natural on the grass, but not on the ice, because the
Answer: ice is different than what they're used to playing on.

Problem: How does the sentence end?

Ian is learning how to give first aid and he needs extra teaching hours from Samuel, so
Answer: Samuel offers to help him.

Problem: How does the sentence end?

Sarah almost drowned while swimming at the pool, but Maria saved them, so
Answer:
Maria was a hero.