Problem: How does the sentence end?

Because Maria knew how to drive and Elena did not,
Answer: Elena failed their driving test.

Problem: How does the sentence end?

Robert is homeless, while Neil is a wealthy person, so
Answer: Neil is feeding the other.

Problem: How does the sentence end?

Laura helped Christine with their exercises, as
Answer: Laura knew how to stretch muscles for warming up.

Problem: How does the sentence end?

Emily knew how to cook many different recipes but Jessica did not, so
Answer:
Emily never had to worry about dinner.