1.As predicted by scientists,global pollution has become one of the severest problems that mankind faces.

2.Competition for these positions is fierce--the applicants this year are five times more than the applicants last year.

3.As the facts show,the education program should fit into the country's economic.

4.This car burns too much gas,moreover,the price is almost twice more than that I want to pay.           

5.To learn about a major international event,we need to consider its historical and political background.