Problem: How does the sentence end?

Benjamin enjoyed reading classical literature more than Joel because 
Answer: Joel had a shorter attention span.

Problem: How does the sentence end?

Jessica sold their handmade knitted dolls and scarves at the craft fair that Patricia attended. 
Answer: Jessica only sold four scarves at the fair.

Problem: How does the sentence end?

Jennifer spilled the beans on everyone while Laura remained silent since 
Answer: Jennifer kept talking.

Problem: How does the sentence end?

Jeffrey fed their guinea pig alfalfa, while Robert fearfully watched from a distance. 
Answer:
Robert was scared of guinea pigs.