-- _____ are the trousers? -- Oh,the black trousers? They are only ten dollars.
The_______ you are in the exam, the_______ mistakes you will make.
-- are the Olympic Games held? --Every four years.
--Is this kite ________? --No, it’s mine. It’s made by ________.
--When did the World Exposition(世博会) in Shanghai begin? --The Expo began ________ May 1, 2010.
--It’s ________ nice day, isn’t it? --Yes, what fine weather!