Gaining the knowledge ________ environmental protection will help you to become a qualified environmentalist.

 “This book is ______ more useful for us students.” “Yes, but it is _______ too difficult.”

You should be          of your          behaviour.

You’re standing too near the camera. Can you move         ?

 When it comes to the civil war in Syria, the US government’s attitude towards it has experienced a(n)_______ change , which may have a positive effect on Syria present situation.