It’s your job________ the pop stars.
April 22nd is Earth Day. Which of the following activities should be organized on that day?
— Listen! ______ beautiful music Lang Lang is playing!—He is such a wonderful pianist!
—Why are you in such a hurry, Anna?—Because I can’t find my schoolbag _______.
They saw the math teacher ______ the classroom just now.
— How long has Bob ______?— Since 2012.