Story needs to be completed:
Jennifer asked Erin what time it was since

My choice:
Erin had remembered to wear her watch.

Story needs to be completed:
Since Randy was quite good at pool and Donald was a beginner,

My choice:
Randy knew how to do various trick shots.

Story needs to be completed:
Laura made a giant caramel sundae for Lindsey because

My choice:
Laura loved making different kinds of desserts.

Story needs to be completed:
Mary visited the gym much more rarely than Katrina, and indeed

My choice:
Katrina was by far the more physically active of the two.