Fast food is becoming more and more popular in China, especially among children and teenagers. There are several reasons 66 
its popularity. First, it is very convenient and 67 a lot of time. You just go into a fast food restaurant, order your food, and your food is ready 68 . Second, you can either eat it there or 69 it away. Third, the environment of fast food restaurants is both clean and 70
（comfort）. Fourth, excellent service 71 (provide) and the quality of food is guaranteed(保证). 72 , as for
nutrition, fast food is far from satisfactory. It is usually not a 73 (balance) diet and low in nutritional value. Fast food is only a good choice when you are in a(n) 74 and turn to it once in a while. It’s good for people, especially children, to eat fast food as 75 as possible.