[Q]: How does the sentence end?

Robert gave rose clippings to Jason but they did not grow, since

[A]: Jason was bad at growing rose bushes.

[Q]: How does the sentence end?

Kenneth hired Joseph to be their personal trainer because

[A]: Kenneth wanted to build bigger muscles.

[Q]: How does the sentence end?

It was easy for Samantha but not Rachel to pass the class because

[A]:
Rachel did not take the necessary steps to study and complete assignments.