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1. Ba: Hello, Liz. What are you doing?
Liz: I′m studying for a history  . Can you help me?
Ba: Sure. What′s the problem?
Liz: Who′s Vo Nguyen Giap?
Ba: He′s a famous  .
Liz: What′s he famous for?
Ba: That′s easy. He′s famous   leading the People′s Army of Viet Nam at Dien Bien Phu. He was its Commander-In-Chief.
Liz: What   at Dien Bien Phu?
Ba: General Giap′s forces defeated the French there in 1954.
Liz: Do you know when the general was born?
Ba: In 1920. No, I′m wrong. It was in 1911. I remember he was 43 when the People′s Army of Viet Nam won the battle.
Liz: Thanks, Ba. You are very good at  .
Ba: Well, I′m really interested in it and I have a lot of history books at home.
Liz: Can I borrow some of them?
Ba: Sure. Let′s go and get some now.