Problem: How does the sentence end?

Randy is suffering from emetophobia and asks for Ian's help, because 
OPTIONS:
- Randy has already experienced it.
- Ian has already experienced it.
Answer: Ian has already experienced it.
sentence: Buying a new truck seemed wise for Rachel but not Sarah because  OPTIONS:
- Rachel needed a truck for work.
- Sarah needed a truck for work.
complete: Rachel needed a truck for work.
To explain the math lesson Tuesday, Donald drew for Ian a diagram that 
OPTIONS:
- Donald drew earlier.
- Ian drew earlier.
Donald drew earlier.
Input: Continue writing.

Donald kept the shrubs in front of their home trimmed neatly but Hunter let theirs go. 
OPTIONS:
- Donald lost the neighborhood award for best lawn.
- Hunter lost the neighborhood award for best lawn.

Continued: Hunter lost the neighborhood award for best lawn.
Story needs to be completed:
Monica loved to eat potato chips but not Cynthia so 
OPTIONS:
- Monica had a very flat belly.
- Cynthia had a very flat belly.

My choice:
Cynthia had a very flat belly.
Problem: How does the sentence end?

Nelson went to the doctors office without Dennis because 
OPTIONS:
- Nelson had to change his prescription.
- Dennis had to change his prescription.
Answer:
Nelson had to change his prescription.