Do you think what are good topics in the english corner?

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hi,I'm not a native english speaker,and I want to improve my oral english,so I am going to the english corner of a university.but I don't know exactly what are good topics to talk about there,do you have some good idears?please tell me.by the way,a english corner is a place for students to practise their oral english with each other and foreign teachers and students in China's universities.