Story needs to be completed:
Joseph proudly showed off his new vertical leap to Jason.  
OPTIONS:
- Joseph was proud of him.
- Jason was proud of him.

My choice:
Jason was proud of him.
Problem: Continue the following story.

Aaron hopes that Adam will want to go on a cruise, because 
OPTIONS:
- Aaron wants to be on the water.
- Adam wants to be on the water.
Here's how I want to continue it: Aaron wants to be on the water.
Problem: Jake bought iceberg lettuce instead of organic kale, because 
OPTIONS:
- lettuce was available at a lower price.
- kale was available at a lower price.

My choice: lettuce was available at a lower price.
[Q]: How does the sentence end?

Nick went to the gym on a schedule while Matthew went irregularly so 
OPTIONS:
- Nick was very fit.
- Matthew was very fit.

[A]: Nick was very fit.
QUES: Continue writing.

Neil stayed dry in the bad weather,  but Hunter got drenched, because 

OPTIONS:
- Neil wore a raincoat.
- Hunter wore a raincoat.
+++++++++
ANS: Neil wore a raincoat.
QUES: Continue writing.

Dennis could build a house on their own but not Derrick because 

OPTIONS:
- Dennis had a lack of construction knowledge.
- Derrick had a lack of construction knowledge.
+++++++++
ANS:
Derrick had a lack of construction knowledge.