The time is not far away when mobile phones _____ widespread in China’s vast countryside. 

The United States _______one of the lowest smoking rates －25.5 percent of the population.

—Alice’s second-hand computer                     wrong although she used it only once.—You’d better go to check it.

At present , the butter factory is still polluting the river though it _____to stop.

--- If he ____, he _____ that food. --- Luckily, he was sent to hospital immediately.