Fast food is becoming more and （61）___ popular in China，especially among children and teenagers．There are several explanations for its popularity．First，it is very convenient and （62）___ a lot of time．You just go into a fast food restaurant to order your food，and your food is ready immediately．（63）___，you can either eat it there or（64）___ it away．Third，the environment of fast food restaurants is both clean and （65）___（comfort）．Fourth，excellent service （66）___ （provide） and the quality of food is high．（67）___，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） （68）___ and have it once in a （69）___．So I would say that It's good for people，especially children，to eat fast food as（70）___ as possible．