Many people prefer large cars, _____large cars are safer than small ones. 

When he looked up, he suddenly found himself          by a group of teenagers, 

       to playing computer games, he is always absent from school．

Nearly four hundred supermarkets in Beijing are preparing to dim(使暗淡) their lights ________ the "Earth Hour 2010" on Saturday night．

I regret ______ that we have no news for you.