—Mum, I'm tired.—Well, if you ________ go to bed after midnight every night, what do you expect?

He _____ be at home, because the light is on.

The first question was difficult, but the rest were pretty easy.

(2013·高考陕西卷)The children________lost in the woods；otherwise，they would have been at the lakeside camp as scheduled.

David, you _____play with the valuable bottle; you_______ break it.