—How many __________ are there in your class？—Twenty-two.

--_________ are the jackets?     --Black．

—When will the 2010 World Expo(世博会) come to a close? —It’ll close at the end of ________. 

Children can play “trick or treat” games on ____in western countries.

Thank you for your _________. They are of great _________ to me.