We play sports on school days. You know, we don’t have enough time and have to do lots of homework.

If I have enough money, Iwill travel _______ the world.[ ]

____no need for us to discuss the problem again since it has already been solved.

Look! These red shorts are _____ sale _____ only $8.[ ]

When will the World Exposition (世博会) begin? —The Expo will beginMay 1, 2010.[ ]