Girls used to take fewer advanced math courses than boys but now they are taking just _______.
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 __________.