Problem: How does the sentence end?

The test was hard for Samuel but a breeze for Randy , since 
Answer: Samuel had failed to study for it.

Problem: How does the sentence end?

Bill wanted to keep his house clean instead of dirty to keep the ants from coming in. Keeping the 
Answer: dirty house was bad.

Problem: How does the sentence end?

Eric has much better posture than William and that makes 
Answer: Eric act a lot more confidently.

Problem: How does the sentence end?

In the underground, Rachel rode further on the subway than Sarah because 
Answer:
Rachel doesn't get sick on the ride.