[Q]: How does the sentence end?

Frank needed clean leggings to wear after tripping in mud and getting his straight pants dirty, so he decided on capris. He took off the 
OPTIONS:
- straight pants because they were dirty.
- capris because they were dirty.

[A]: straight pants because they were dirty.
QUES: Continue writing.

He didn't appreciate the trumpet as much as the violin because he thought the 

OPTIONS:
- trumpet made serene music.
- violin made serene music.
+++++++++
ANS: violin made serene music.
Problem: How does the sentence end?

Ally wanted to make her old pen into a flower pen, because the 
OPTIONS:
- old pen was fun.
- flower pen was fun.
Answer: flower pen was fun.
sentence: Robert is going to look good at Prom while Justin is not going to look good at Prom.  OPTIONS:
- Robert looks good at Prom.
- Justin looks good at Prom.
complete: Robert looks good at Prom.
Kenneth cooked a nice meal of spaghetti for Donald at dinner because 
OPTIONS:
- Kenneth wants to impress him.
- Donald wants to impress him.
Kenneth wants to impress him.
Problem: Continue the following story.

Victoria installed a koi pond in Patricia's yard even though it was freezing cold out, because 
OPTIONS:
- Victoria owed their friend a favor.
- Patricia owed their friend a favor.
Here's how I want to continue it:
Victoria owed their friend a favor.