Perhaps John’s not in. — _______. Look, the light is on.

I’m looking for the wallet __________ I lost yesterday.[ ]

I’ll not be Jack’s friend any more.—Don’t be angry. He’s just so , but in fact he’s good to us, you know.

Is it your brother playing football outside? — It ________ be him. He is helping mother with dishes now.

He ought to have been warned of the danger.—_______, but he wouldn’t listen to me.