[Q]: How does the sentence end?

Jeffrey had black circles under their eyes after spending the night at Christopher's house, and 
OPTIONS:
- Jeffrey decided not to host a sleepover again.
- Christopher decided not to host a sleepover again.

[A]: Christopher decided not to host a sleepover again.
QUES: Continue writing.

Maria couldn't stop moving at the club but still saddled up to the bar to ask for another drink from Betty. 

OPTIONS:
- Maria was bartending.
- Betty was bartending.
+++++++++
ANS: Betty was bartending.
Problem: How does the sentence end?

Tanya helped Emily to sit down and write out their goals, because 
OPTIONS:
- Tanya was experienced at this.
- Emily was experienced at this.
Answer: Tanya was experienced at this.
sentence: Natalie puts less chili flakes on their pad Thai than Rachel because  OPTIONS:
- Natalie loves spicy foods.
- Rachel loves spicy foods.
complete: Rachel loves spicy foods.
The blender was always used by the winning chef, while the loser used the mixer, because the 
OPTIONS:
- mixer had dull blades.
- blender had dull blades.
mixer had dull blades.
Problem: Continue the following story.

The lab tech poured the urine from the sample cup into the testing device until the 
OPTIONS:
- sample cup was full.
- testing device was full.
Here's how I want to continue it:
testing device was full.