Problem: How does the sentence end?

Benjamin hired Brett to restring and tune his new guitar because 
OPTIONS:
- Benjamin didn't know how to.
- Brett didn't know how to.
Answer: Benjamin didn't know how to.
sentence: Exercise is not something Jason likes, but Robert loves to do it.  OPTIONS:
- Jason is a gym goer.
- Robert is a gym goer.
complete: Robert is a gym goer.
The waiter could not cover the round tables with the square tablecloths because the 
OPTIONS:
- tablecloths were round.
- tables were round.
tables were round.
Input: Continue writing.

The doctor replaced the dirty carpet in her office with stained concrete over the summer, the 
OPTIONS:
- carpet was trendy.
- concrete was trendy.

Continued: concrete was trendy.
Story needs to be completed:
Brian obtained a naturalization certificate before Michael because 
OPTIONS:
- Brian had already been granted U.S. citizenship.
- Michael had already been granted U.S. citizenship.

My choice:
Brian had already been granted U.S. citizenship.
Problem: How does the sentence end?

The bench was a more comfortable seat than the chair because the 
OPTIONS:
- bench was less cushioned.
- chair was less cushioned.
Answer:
chair was less cushioned.