This is the VOA Special English Economics Report. Representatives of the International Monetary Fund and the World Bank have gathered in Washington. World Bank President Robert Zoelick spoke to them on Thursday. This is the last time he attends the spring meetings of the two organizations as World Bank president. Earlier this week, Jim Yong Kim was officially chosen as the bank’s twelfth president. Mr. Zoellick said developing countries are now engines of growth. “Developing countries have provided two thirds of global growth over the past five years,” he said. But he added that many developing nations still face big problems. He said all members need to work together “for their common interest.”