JOHANNESBURG, SOUTH AFRICA JULY 24: A teacher holds a night class for refugees from Zimbabwe in the Central Methodist Church on July 24, 2007 in central Johannesburg, South Africa. Thousands of refugees sleep here in a four-story building with in bad conditions. Millions of Zimbabweans has fled the country since 2000, to look for a better life in South Africa. .(Photo by Per-Anders Pettersson/Getty Images).