China's high-speed railways _________ from 9,000 to 25,000 kilometers in the past few years.
are growing
have grown
will grow
had grown
Xiamen—Shenzhen High Speed Railway opened to traffic on Dec.28 last year, _______ the two of China’s economic zones.
________ with the courage and determination of the young cancer patient, many people left messages in his microblog, encouraging him to fight with the disease.
Having taken our seats, _______.
The students listened carefully to the teacher with their eyes _____ on the blackboard.
With our knowledge practice , we can make contribution to our society.