I am really upset about tomorrow’s exam. I am always so slow. _______! You can pass it. You have been working hard on it, haven’t you?
It’s _____ you do today that will make a difference in your life tomorrow.
Mr. Green showed his students some photos ________ at World Expo 2010 Shanghai.
A group of children are looking into the box, ____ about what can be inside.
I must be off now. My friends ________ outside.
David is a great teammate. He knows well how to work with __________.