Teachers have to constantly update their knowledge in order to maintain their professional ______. 

 The doctors must get there in half an hour. There should be no____ in sending the blood to the dying girl .

Your as a student will be excellent if you develop a habit of reflecting on how you learn.

In a(n) _____ to help preserve history, the Greek government established a committee to undertake the professional restoration of the Acropolis.

 It’s bad ___________ for a man to smoke in the public places where smoking is not allowed.