Problem: How does the sentence end?

Aaron wanted to know how to clean a deck and asked Michael, since 
Answer: Aaron forgot how to do it.

Problem: How does the sentence end?

The clique of Cynthia is filled with nerds, while Jessica hangs with the popular kids, so 
Answer: Cynthia is a geek.

Problem: How does the sentence end?

Because Joseph was not planning to get married to his current girlfriend but Nick wanted to marry his girlfriend, 
Answer: Nick proposed to his girlfriend.

Problem: How does the sentence end?

The rail service had problems but the bus service did not because the 
Answer:
bus service was very regular.