Problem: How does the sentence end?

While fixing the bike, the rust had to be replaced with chrome.  The 
OPTIONS:
- rust was in style.
- chrome was in style.
Answer: chrome was in style.
sentence: The man tried to to use the new gas to fill the car but the  OPTIONS:
- car was too new.
- gas was too new.
complete: gas was too new.
The essay of Felicia was more popular than Natalie's since 
OPTIONS:
- Felicia devoted a lot of time to the paper.
- Natalie devoted a lot of time to the paper.
Felicia devoted a lot of time to the paper.
Input: Continue writing.

Derrick had to wash Kyle with a wet sponge everyday, because 
OPTIONS:
- Derrick was a caretaker.
- Kyle was a caretaker.

Continued: Derrick was a caretaker.
Story needs to be completed:
Mary went shopping for a mattress last weekend without Rachel because 
OPTIONS:
- Mary needed a new one.
- Rachel needed a new one.

My choice:
Mary needed a new one.
Problem: How does the sentence end?

It was easy for Joel but not Kevin to have fun on the camping trip because 
OPTIONS:
- Joel had not learned how to enjoy the outdoors.
- Kevin had not learned how to enjoy the outdoors.
Answer:
Kevin had not learned how to enjoy the outdoors.