阅读理解根据对话内容，从对话后的选项中选出能填入空白处的最佳选项。
A: I need to lose some weight. My clothes don't fit anymore.____
B: Well, instead of watching TV all day, you could do more exercise.
A:____
B: Like cycling, or you could work out at the gym.
A: I don't have time.____
B: OK, then you could change your diet.____
A: You mean no more hamburgers! Oh no!
B: OK._____
