1.As predicted by scientists, global pollution has become the most serious that mankind has ever faced.
2.Competition for the posts is fierce - there are five times as many applicants this year as last year.
3.As the facts show, the educational program should conform to the country's economic development plan.
4.The car burned too much gas and cost almost twice as much as I wanted to pay.
5.To understand a major international event, we first need to consider its historical and political background.
