1) As scientists' prediction（has predicted） that,global pollution has became the most（/serious/severe） problem that humankind（menkind/the human race）

2）（Competition for these positions ） Secking those jobs' competition is very fierce（hot）,we have five times as many tough applicants this year as we did last year.

3) As truth indicated （showed/demonstrate）that,educatat outline （educational programs 教育方针） need to accord with（fit into）nation plan for economic

4)The car burns too much gas, and morrover , the price（approximately/about/almost） is the double I wanted（intend） to pay

5) To understand a great（significant/internation）event, we should  first consider the historyical and political background to it.