[Q]: How does the sentence end?

Angela spent a long time on their book review but Betty didn't, so

[A]: Betty scored a low grade on their assignment.

[Q]: How does the sentence end?

Emily is really bad at science and asks for instructions from Carrie, because

[A]: Carrie is already good at science.

[Q]: How does the sentence end?

Benjamin was clumsy while Steven was light on their feet, so

[A]:
Benjamin was bad at sports.