原:1.As the scientists said, the global has been one of the most serious problems human face.
改:As is predicted by scientists , global pollution has become one of the most serious problem humans are faced with.
原:2.The competition for these jobs are tough ,the number of applicants this year is five times that of last year.
改:Competition for these jobs is very tough ,we have five times as many applicants this year as we did last year/ there are five times as many applicants this year as there were last year.
原:3.As is convinced by fact, the education should fit into the plan that develop the country's education.
改:As it is ,education program should fit into national economic development plan.
原:4.This car burns too much gas , the price is almost twice as much as l want to pay./is one times higher than l want to pay/is two times the money l want to pay/more than two times as often as I want to pay/is two times that of l want,moreover.
改:The car burns too much gas,and moreover,the price is almost twice as much as I intend to pay.
原:5.To learn a significant international ,we need to think about its history and background first.
改:We should consider its history and political background at first when want to know a major international event.