Fast food is becoming more and  _____  popular in China, especially among children and teenagers. There are several explanations for its popularity. First, it is very convenient and             a lot of time. You just go into a fast food restaurant to order your food, and your food is ready immediately.             , you can either eat it there or             it away. Third, the environment of fast food restaurants is both clean and                （comfort）. Fourth, excellent service                  (provide) and the quality of food is high.           , fast food isn’t healthy enough. It is usually not a balanced diet and low in nutritional value. Fast food is only a good choice when you are in a(n)              and have it once in a            . So I would say that It’s good for people, especially children, to eat fast food as              as possible.