All the other boys have geography books and they will be ahead of me if I don’t get ______.

My grandma still treats me like a child. She can’t imagine ______ grown up. 

We must ______ known to all that smoking is harmful to heart.

(2012·山东高考)When you are done with the book, just give it to Lucy or Helen or ________.

--Can you let these new graduates take on the task?---I’m afraid not. While they are energetic and ambitious, ____of them seems to be suitable for this demanding job.