Smile is recognized as a/an _________ language, which can be understood by people all over     the world.

 It is well known that Germany’s car industry is        its beer. 

Don’t expect too much of him. After all , he is a child of ______ intelligence.

You’d be exposed to a lot ______ pollution if you moved to a town with pure water and air.

The twins has studied in this school  ________    .