A big problem I had with my apartment was a leaking toliet. Last year, I woke up on a Saturday morning and found the bathroom flooded with water. I searched for the root of the problem and noticed there was water leaking from my toilet. I called a plumber right away and requested an appointment. Unfortunely, the plumber wasn't able to come immediately. When he did arrive, the flood has spread to the dinning room. The plumber fixed the leak within minutes, but I still had to deal with the flooded apartment and my dog, who was happily splashing about and having th time of his life. It took several time to clean everything up By the time I was done, I was thoroughly exhasted. I realized from that experience that I needed to learn how to fix the toilet myself. By doing this, I would be able to handle any problems with it and prevent this situation from ever happening again. I came across this article in my book. This is a sample answer fot OPIC test. I think there are a few expressions that don't seem natural. First, I'm not sure if "the root" is correct. I think "reasons or causes" are more natural. Second, I'm not sure if "requested an appointment" is correct. Other than that, if there are anything that aren't natural, could you please correct them? Thank you so much for your time and your help.