Tom:   You know we’ve always wanted to do a long bike trip. Why don’t we ride the bike there during the summer holidays?
Bill: That’s a good idea. But where’re we going?
Tom:   What about cycling along the Mekong River?
Bill: It sounds interesting. Where do you plan to start the trip?
Tom:   I’d like to find the source of the river and start from there.
Bill: I think that’s exciting. Let’s search for more information on the trip at the library.
Tom:   Sure. Let’s go.