In order to reduce the increasing prices of vegetables , the toll(过路费)           if a truck carrying them passes through a toll station .

It was not until the subprime loan crisis（次贷危机） ____ great damage to the American financial system that Americans ____ the severity of the situation．

With the help of high technology, many new substances（物质）______in the past years.

 For some time, Chinese people, under the leadership of CPC, ________ the contents of the Scientific Development Concept in the course of practicing socialism in China.

 — Where are you living now?— In Chicago. But I ______ in New York for 3 years.