It’s not ______ good idea to drive for four hours without ______ break.
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 ________.
I was about to walk over to Tom’ s seat when he ________ and left.