That bag isn’t mine. It may be __________.

We are so tired. ______ we could take the day off tomorrow!

Mr. Black is working ______ his project at home. [ ]

Where’s David?—He ______ be in the playground because he is fond of playing basketball.

On February 25, 2013, Li An, a Chinese director, won the best director again. It is histime to win an “Oscar”.