The conference has been held to discuss the ________of global warming on people’s lives all over the world.

There has been a（n）____of sadness in the small town since a boy was drowned in the river．

 So far there have been hundreds of _______ infected with H1N1in our province.

Although Tan Weiwei began her_______by singing in a local Ear, she is now a famous star.(成都市)

I’d like to take _____ of this opportunity to thank you for your help.