Problem: How does the sentence end?

I poured tea from my mug that the waiter gave me to the cup until the
OPTIONS:
- cup was empty.
- mug was empty.
Answer: mug was empty.

Problem: How does the sentence end?

Prior to the 80"s theme party, Kenneth studied the clothing styles, while Nick went partying, so when at the theme party
OPTIONS:
- Kenneth looked very groovy.
- Nick looked very groovy.
Answer: Kenneth looked very groovy.

Problem: How does the sentence end?

Joseph ordered pancakes for Derrick without asking because
OPTIONS:
- Joseph had always ordered them for breakfast.
- Derrick had always ordered them for breakfast.
Answer: Derrick had always ordered them for breakfast.

Problem: How does the sentence end?

Randy is better at playing pretend with kids than Kenneth because
OPTIONS:
- Randy is a more serious person.
- Kenneth is a more serious person.
Answer:
Kenneth is a more serious person.