It is said that bad living habits as well as dirty surroundings, stuffy rooms and some other factors ________ the wide spread of H1N1.
_____ the 2000 Olympic Games will be held in Beijing is not known yet.
What the doctors really doubt is _____my mother will recover from the serious disease soon.
_____we’ll go camping tomorrow depends on the weather.
Does _______ matter if he can't finish the job on time?
I hate _____when people talk with their mouths full.