Eric, isn’t this book yours?—Yes, it used to belong to _________, but from now on it isn’t.
Jack, is there ______ in today’s newspaper?——No, nothing.
Listen! Is Mary playing the piano in the room? –No. It ________ be Mary. She has gone to Hong Kong.
His parents for over 40 years and they love each other very much.
It’s necessary us English well.[ ]