[音频]Listen and complete a conversation between an architect and her client.Architect: Keystone Architecture. This is Donna.Client: Hi, Donna, it’s Jim North. I’m calling about the 1 ______________ that you sent me.Architect: Is there a problem?Client: Well, I’m wondering, why do we need the 2 ______________ on the ceilings?Architect: Oh, vaulted ceilings create more 3 ______________ .Client: So they make rooms look 4 ______________ ?Architect: Yes, exactly. The only downside is that they can 5 ______________ energy costs.Client: In that case, I’d rather go with flat ceilings so we’re not 6 ______________ energy.