Expo 2010,Too crowded?

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I am planning to go to shanghai china for the Expo 2010 this month.But i fell a little confused.Due to a great number of people will go to shanghai.Most of the buliding I want to see is too crowded so people have to stand in a queue.I am eager to see the different buliding from different countries.but i don't like crowded place.I am glad to receive any suggestion from you.