1.As scientists predicted, global pollution into one of the most serious problems facing humanity.

2.The fierce competition for these positions is very intense - this year's applicants five times the last year.

3.As the fact  show, the educational program should fit into the national plan for economic developing.

4.This car burns too much gas,moreover its price is almost as much as twice that I want to pay.

5.In order to know a significant national event,firstly we need to think about its history and political background.