Fortunately somebody who happened to be passing by called the emergency aid the traffic accident occurred

I’d like to have your opinions about my written report. — _______. But I have one suggestion.

Only by increasing the number of doctors by 50 percent properly in this hospital.

下列词语中加横线的字，读音有错误的一组是（ ）

Beijing, the capital of China, is one of _________ cities in the world.