Whatever rank you may be in, it would be wrong to the law into your own hands.
It was in the lab ______ was taken charge of by Pro. Harris ______ they did the experiment.
The public ______ of the environmental problem will make the government take it seriously.
--Can you tell me ______ I can do with the broken computer?-- Sorry, you’d better ask an expert ______ to deal with it.
The English are proud of the 30th Olympic Games _______ in London in 2012.
The World Expo Shanghai 2010 is more like a platform for cultural exchange, ________ people into closer contact with the rest of the world.