The blackboard was wiped _____ . 

Overpopulation is a terrible threat to the human race.Yet it is probably ____ a threat to the human race than environmental destruction.

 Looking at my mother's ___________ face, I regretted not having told her my whereabouts on the phone.

The dress is two sizes ____for me．Would you please show me another one?

Microblog（微博）        with so many people is sure to influence our society..