When we were young, every evening my brother and I _____stay at home waiting for our mother to come back from work.

– Who didn’t turn off the light after school yesterday?– It ______ be Lucy. She told me she was the last one to leave the classroom.

—Can I go to the park, Mum?—Certainly. But you ______ be back by six o’clock. 

The magazine was started by Becky, ______ I know.

— Simon, when are we going to have a class meeting this week?— Sorry. Ask our monitor, please. He         know.