Problem: How does the sentence end?

Carrie could not handle the R movie, while Cynthia was fine with it, because
Answer: Carrie was insufficiently mature for it.

Problem: How does the sentence end?

Nick asked Robert for help filling out the housing application because
Answer: Robert understood the language.

Problem: How does the sentence end?

The herbs in Samantha's garden taste better than the ones that Erin has grown because
Answer: Erin is the dumber gardener.

Problem: How does the sentence end?

There was room for Kevin but not Aaron to improve their grades because
Answer:
Kevin received all Fs on the report card.