Problem: How does the sentence end?

Donald ate so much food at dinner but Randy didn't touched his food. At the end 
OPTIONS:
- Donald stomach was empty.
- Randy stomach was empty.
Answer: Randy stomach was empty.

Problem: How does the sentence end?

The house needed redecorating, which Tanya was much better at than Angela, since 
OPTIONS:
- Tanya was much messier with paint.
- Angela was much messier with paint.
Answer: Angela was much messier with paint.

Problem: How does the sentence end?

Since 
OPTIONS:
- Benjamin could see, Benjamin described how the beautiful landscape looked to the bemused Neil.
- Neil could see, Benjamin described how the beautiful landscape looked to the bemused Neil.
Answer: Benjamin could see, Benjamin described how the beautiful landscape looked to the bemused Neil.

Problem: How does the sentence end?

Monica hated giving speeches in school unlike Betty because 
OPTIONS:
- Monica was a lot more confident.
- Betty was a lot more confident.
Answer:
Betty was a lot more confident.