Problem: How does the sentence end?

Before selling the watches they had to clean the crevices off. The 
OPTIONS:
- Watches were very expensive.
- Crevices were very expensive.
Answer: Watches were very expensive.
sentence: Jerry bought his supplements at the grocery store instead of at the gym because they were expensive at the  OPTIONS:
- gym .
- grocery store .
complete: gym .
We're doing survival training in the woods this weekend and I'm definitely going to take my pocketknife, but maybe not my lighter because the 
OPTIONS:
- pocketknife is more useful.
- lighter is more useful.
pocketknife is more useful.
Input: Continue writing.

The doctor drew the blood more often to test for the bacteria than the virus because the 
OPTIONS:
- bacteria was more serious.
- virus was more serious.

Continued: bacteria was more serious.
Story needs to be completed:
Kenneth was a well known pediatrician and Adam was their patient, so 
OPTIONS:
- Kenneth took medical advice.
- Adam took medical advice.

My choice:
Adam took medical advice.
Problem: How does the sentence end?

Since Erin owned an acoustic guitar while Victoria owned an electric one, 
OPTIONS:
- Erin played quieter songs without an amp.
- Victoria played quieter songs without an amp.
Answer:
Erin played quieter songs without an amp.