【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.
【单选题】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 .