31. Do you know when did the world _____?

A．come into being

B．come

C．formed

D．Existed

You want to write an article for your school newspaper about your friend Liangliang. He used to be overweight and didn’t like to be active. After exercising and going on a diet, he now looks like a different boy. Write your article according to the following pictures and also give people some of your own advice.

参考词汇：overweight, chicken and chips, balanced diet, good figure / shape