Our research has focused on a drug which is so _____ as to be able to change brain chemistry. 

You should be          of your          behaviour.

 The opening ceremony of the Olympic Games will be broadcast ______ this weekend. You can expect an exactly ______ night. 

Since　the　matter　was　extremely＿＿，we　dealt　with　it　immediately．　　

In big cities, some workers from the countryside have been tired of moving around and wish for a more    ______ life.