Problem: How does the sentence end?

The customer ask the waitress to exchange the mug for the cup on the counter because the 
OPTIONS:
- mug looked dusty.
- cup looked dusty.
Answer: mug looked dusty.

Problem: How does the sentence end?

The wedding was held in the banquet hall instead of the ballroom although the 
OPTIONS:
- banquet hall was better decorated.
- ballroom was better decorated.
Answer: ballroom was better decorated.

Problem: How does the sentence end?

The graphic novel that Robert wrote sold fewer copies than Michael, so 
OPTIONS:
- Robert is the more advanced writer.
- Michael is the more advanced writer.
Answer: Michael is the more advanced writer.

Problem: How does the sentence end?

The taxes on the car were more than the taxes on the bike because the 
OPTIONS:
- car was more cheap.
- bike was more cheap.
Answer:
bike was more cheap.