1As the scientists as predicted, global pallution has become one of the most serious problems that humans are faced with.

2The competition for these jobs is really tough -- there are five times as many applications this year as there were last year.

3As the facts show ,the educatinal programs need to fit into the national plan of? economical development.

4This car burns,too much gas ,and moreover, the price is almost twice as much as I thought before.

5to understond a great internationol event, we should think the historical and political backpround of it at first.