1.As is predicted by scientists , global pollution has become one of the most serious problems humans are faced with.

2.Competition for these jobs is very tough - we have five times as many applicants this year as we did last year.

3.As the facts show , educational programs need to fit into the national plan for economical development.

4.The car burns too much gas , and moreover , the price is almost twice as much as I inlend to pay.

5. To understand a great international event , we , first of all , need to consider the historical and political background to it .