The first time I ________ here, it was the year of 1980; this is the third time that I _________ to Chongqing.
He was disappointed ____ he had learned from books quite differed from his actual life.
It was the A/N1H1 epidemic ____ spread almost throughout the country ____ promoted the research and production of the flu vaccine.
The traffic in Shanghai will be blocked and people will come to blows _____ the government plans in advance.
— Where’s your assignment? — ____
The customers objected ____ unfairly in the course of shopping.