Look! The light is still on. Is Mr Wu working in his office？—No, it _____ be Mr Wu. He has gone to Nanjing for a meeting.

Alice, please tell Eric to call me when he _____ back. –No problem.

He must have finished his homework for a long time, _____ he?

May I ________ your dictionary?— Sorry, I _______ it at home.

）The red bike _______be Hu’s. She has a blue bike.