短文改错(共10小题；每小题1.5分，满分15分)
In 1972, the United Nations hold a meeting in Sweden 小题1:___
to share ideas about ways to take better care of for the 小题2:___
earth．At the summit, people from more than one hundreds 小题3:_____
countries discussed some of the important problems faced 小题4:_____
our planet．Since then, several Earth Summits had been held. 小题5:____
In 2002, the Earth Summit was held in Johannesburg. 小题6:___
One of the main theme was “sustainable development”, or 小题7:__
the question what we can continue developing the world 小题8:_____
without damage the environment．Most of the speakers 小题9:___
talked the three biggest killers in the world. 小题10:______