【单选题】World Expos can _______ special in a number of ways.
【单选题】The World Expos have always served as important platforms to display ______ ideas.
【单选题】World Expos are regarded as___in that they are open to not only celebrities, but also to common people.
【简答题】World Expos have played an important role in promoting international exchange.
【简答题】World Expos are regarded as______(aim) increase sales in Europe.
【单选题】World Expos can _________ special in a number of ways.
【单选题】World Expos have played an important role in promoting international exchange .