Is the sentence correct or does it contain a sentence unity problem? Read the article To be or not to be: Maintaining sentence unity to help you out.

1. Many Ottawa-area cyclists agree that the best place for a bike ride is going to the Gatineau Hills.a) is correctb) has a problem
2. Physics is one subject where you can end up facing profound questions about the nature of existence.a) is correctb) has a problem
3. The reason Farouk has difficulty finding decent shoes is that his feet are not the same size.a) is correctb) has a problem
4. One thing that prevents me from living abroad is when I think of missing my family, my friends and my dog.a) is correctb) has a problem
5. You may be skeptical, but I know that the reason Missy won the Centreville Idol competition is because she is the daughter of one of the judges.a) is correctb) has a problem
6. A characteristic that I admire is a person who is generous.a) is correctb) has a problem