1.As predicted by scientists, global pollution has become one of the most serious problems that mankind has to face.
2.Competition for these positions is fierce -- there are five times as many applicants this year as last.
3.As the facts show, the educational program should be in line with the country's economic development plan.
4.The car consumes too much gas, and besides, it costs almost twice what I wanted to pay.
5.To understand a major international event, we first need to consider its historical and political context.
