Dodi: Guys, I need your attention. Now, we are going to discuss about our class vacation destinations. So, who can come up with the first idea?

Roni: What about Seribu Islands? It's one of the nearest islands we can visit.

Dodi: Is there anyone who disagrees with Ronis idea?

Lia: I think we have to think of other different places because we've already gone there several times.

Roni: Oh, yeah! You're right. I forgot about that.

Riko: Well, I suggest Kebun Raya Bogor. We've never been there.

Diana: I agree with your choice, Riko. I've never been there either.

Deni: Neither do I. I'm with you Dlana. Seeing great trees and plants might be exciting. Kebun Raya Bogor is like a great jungle in the middle of town.

Sarah: I'm sorry, I'm afraid I have to disagree with that. It'rainy season now. As you know, Kebun Raya Bogor is located in Bogor, the city of rain Seeing the Intensity of rainfall throughout Indonesia lately, I think we might not be able to explore the whole Kebun Raya Bogor due to the rain.

Tito: I think what Sarah cald is right. Kebun Raya Bogor is not the best place to visit during the heavy rainy season.

Dodi: Well, any other ideas?

Rio: How about Bali?

Roni: No way! I don't have enough money to go to Bali

Sarah: It's true. It's really costly to pick Ball as our destination.

Doni: Okay, guys. To save time, let's just write your ideas on a piece of paper and we will discuss them tomorrow. Thank you.

What is the subject of the discussion?