Sure! Here’s how the dialogue can be completed:

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**Nhi:** Hi, Thanh! What are you reading?
**Thanh:** (1) **B. Hi, Nhi! I’m reading about Nung people.**
**Nhi:** Oh, I see. You’ll give a lecture on ethnic minorities, won’t you?
**Thanh:** Exactly.
**Nhi:** What have you learned so far?
**Thanh:** (2) **A. Yes. But they also live in earthen houses, and half stilt- half earth houses.**
**Nhi:** Let me help you to revise it.
**Thanh:** (3) **C. A lot. And I must learn by heart.**
**Nhi:** Well, where do the Nung live?
**Thanh:** (4) **D. They mostly live in the northern provinces.**
**Nhi:** What is the population of the Nung?
**Thanh:** About 1 million people.
**Nhi:** Do they live in stilt houses?
**Thanh:** (5) **E. They celebrate many festivals in a year, but “Lung Tung” is the most famous one.**
**Nhi:** What is their main source of living?

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Feel free to ask if you need more help!