Sure, here is the completed conversation:

Lucas: Hi, Minh. How was your vacation? (1) **Where did you spend it?**
Minh: Hi, Lucas. It was great. I went to my uncle's farm in the Mekong Delta to pay a visit.
Lucas: (2) **What did you do there?**
Minh: A lot of things. My cousins and I enjoyed going fishing, herding cattle, flying a kite, picking fruit...
Lucas: Sounds great! (3) **Which activity do you like most?**
Minh: Well, it's hard to say. Each activity gave me a different feeling. But I like the surroundings and environment there.
Lucas: (4) **It's peaceful and quiet, isn't it?**
Minh: Yes, it is. It's not so noisy and busy as in the city. Fresh air and vast green fields make me feel very relaxed. (5) **My uncle's farm isn't too big but it has many things I like.**
Lucas: What are the things you like about your uncle's farm?
Minh: Paddy field, fish pond, and fruit orchard... What beautiful scenery! (6) **And I took many photos, but they're not here now.**
Lucas: Wow! I wish I could see it with my own eyes.
Minh: Oh, you can totally do that. (7) **Do you want to join me next time?**
Lucas: Yes, I do. I really want to visit some place like your uncle's farm.
Minh: (8) **I promise I'll invite you when I get there again.** It may be after this school year.
Lucas: Thank you very much. You're so kind.
Minh: Don't mention it.