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:______