By the time the fire-fighters arrived, the fire had been put___by the teachers and the students.
.----The research on the news bird flu virus vaccine is challenging and demanding.Who do you think can do the job? ----____ my students have a go ?
----Why were so many people trapped into buying the stock of the company? ----______enough money within one night .
It is global warming, rather than other factors, _____the extreme weather.
._____the crisis of economy getting more and more serious, the government is searching for ways to improve people’s life.
Taiyuan, a city in North China, was struck by a heavy snow last week, _____serious traffic problems. A.facing B.faced C.having faced D to face