[Q]: How does the sentence end?

Felicia was able to grow beautiful multi-colored lilies in the backyard without a problem, but Sarah struggled to get anything to grow, because 
OPTIONS:
- Felicia did not have a greenthumb.
- Sarah did not have a greenthumb.

[A]: Sarah did not have a greenthumb.
QUES: Continue writing.

I used an ax to chop down a tree, but had to get a bigger ax because the 

OPTIONS:
- ax was too small.
- tree was too small.
+++++++++
ANS: ax was too small.
Problem: How does the sentence end?

Felicia's textbooks included information about amino acids, while Samantha's textbooks included information about building bridges, because 
OPTIONS:
- Felicia was a civil engineering major.
- Samantha was a civil engineering major.
Answer: Samantha was a civil engineering major.
sentence: Two different methods to help the blind people at the shelter, Maria raised money for it while Natalie preferred to do work for it because  OPTIONS:
- Maria was a volunteer.
- Natalie was a volunteer.
complete: Natalie was a volunteer.
It is hard to quit smoking tobacco but Felicia succeeded while Samantha failed as 
OPTIONS:
- Felicia has a weak will power.
- Samantha has a weak will power.
Samantha has a weak will power.
Problem: Continue the following story.

Bob preferred to use pills rather than therapy to treat his tendinitis because it was easier to take the 
OPTIONS:
- pills .
- therapy .
Here's how I want to continue it:
pills .