[Q]: How does the sentence end?

In order to clean the vomit from the carpeted floor, the custodian used the vinegar rather than bleach, since the 
OPTIONS:
- bleach was gentle.
- vinegar was gentle.

[A]: vinegar was gentle.
QUES: Continue writing.

Being a doctor was always Nelson's dream while Kevin wanted to be a lawyer, so 

OPTIONS:
- Nelson went to medical school.
- Kevin went to medical school.
+++++++++
ANS: Nelson went to medical school.
Problem: How does the sentence end?

Mary poured the entire bottle of cleaning soap into the bath until the 
OPTIONS:
- bottle was empty.
- bath was empty.
Answer: bottle was empty.
sentence: Michael liked to play the piano. Randy did not.  OPTIONS:
- Michael thought the piano was a terrible instrument.
- Randy thought the piano was a terrible instrument.
complete: Randy thought the piano was a terrible instrument.
After giving birth, Elena changed more diapers than Mary because 
OPTIONS:
- Elena forgot how to clean up the poop.
- Mary forgot how to clean up the poop.
Mary forgot how to clean up the poop.
Problem: Continue the following story.

Bad posture causes the shoulders to round and the hips to arch. The 
OPTIONS:
- shoulders do this because the thoracic spine is curved backward.
- hips do this because the thoracic spine is curved backward.
Here's how I want to continue it:
hips do this because the thoracic spine is curved backward.