-Excuse me.Could you wake me up when my friend______here?-Of course.But we still don’t know when your friend ____ here.

When I came home, my father _____ an e-mail on the computer. 

—Why did you go there?—I __________the homes of movie stars. 

—Can you tell me if Tom has finished his homework?—I've no idea. He ________ it this morning.

—Miss Li, are we going to have a picnic tomorrow?—Yes. But if it ______, we’ll do some reading instead.