更改英语作文时态

更改英语作文时态
As we know that the 2010 Shanghai World Expo whose theme is that cities make people's life better will be on from May 1st to October 31th.There will be more than two hundred countries and international organizations and up to seventy million people attend the world expo.The main content of it is that cities can provide more towardly.living environment and can improve people's standard of living for that 55% of the global population live in cities till 2010.
In my opinion,for the world expo will be held in developing country for the first time,it's a good chance to show the good development of China and thus can drive the development of economy at the same time.
Therefore ,let's look forward to it.
麻烦各位把这段英语作文时态由将来时改成完成时..