No one in the department but Tom and I        that the director is going to resign（辞职）. 

—Long time no see．Haven't you graduated from college?—Yes．I____business management for 4 years in Beijing．

China _______________a high-speed railway network covering almost all its cities with a population of of more than 500，000 by 2015．

With a travelling speed of up to 350 kilometres per hour, the railway to be built between Beijing and Shanghai _______ the journey time from 12 hours to 5 hours．

Years ago we didn’t know this , but recent science______that people who don’t sleep well soon get ill.