Have you ever imagined that you lived in a forest next to a lake? You built a wooden house which was warm and quiet. You liked to walked along the lake wtih fresh air and blue sky. You always went boating with your family and came back with a few fish which could be your dinner. When you open your eyes, you find that you just had a daydream in your office.All the things mentioned above just appeared in your dream. The traffic outside the bulidings reminds you that you are living in a city, then keep finishing your work until 6 P.M. If you are lucky enough and have no extra work, you can go home on time. Day by day's hard work give you a strong impulsion that you want to leave the city and move to suburb. Usually you have a few days off to enjoy whatever you want every year. We call that a vacation. You pack your bag as fast as posssible and eventually reach the place with a wooden house, a lake and blue sky. You stay there for a few days, then return your city. So, it's no matter whether we prefer to live in the city or a suburb. It's never a question, we never have chances to choose.