US President Barack Obama is expecting the economy to show some _________ of recovery．

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

 The need for an operation，especially an immediate operation， almost always comes as a ______ to the patient and his family. 

I’ll look into the matter as soon as possible.Just have a little______.

China has got a good          for fighting against the flu with its careful and smooth organization.