下图所示等高线中，表示集水线的是（ ）A a线 B．b线 C．c线 D．d线
---Will you please spare me a few minutes to accept my interview, Mr Yang Liwei now? ---________. But I’ll be free this evening. Would you mind?
Some famous singers live on the _________ from their record sales.
The World Trade Organization (WTO) finally opened its door to China on November 10, ______ our Chinese 15-year wait.
Qingdao is _______ most beautiful coastal city and I think I’ll go there for _______ second time.
A beach house caught fire last night, ______seven students living in it.
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