when the newspaper boy got to a blue door, _________, which frightened him away as fast as possible.

At no time, as we know, _______ forget that solving Taiwan Issue is entirely internal Chinese affair.

Anyone, once ____ positive for H7N9 flu virus, will receive free medical treatment from our government.

Not until all the fish die in the river ____ how serious the pollution was.

(2013·安徽省名校联盟模拟)West of the city　　　, which provides a lot of job opportunities for the local people.