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.

Is there ___________ in today’s newspaper, Mum — Yes, Germanwings plane 4U9525 has crashed(坠毁) in French Alps –no survivors(无一生还).

The tiger, once a animal to humans, is now of disappearing on the earth.

Helen had to shout aloud ______above the sound of the music .

The professor in the letter is from Shanghai.