--When did the World Exposition(世博会) in Shanghai begin? --The Expo began ________ May 1, 2010.
Most of the young people can hardly speak any Chinese,________?
He likes watching the children________football.
—Have you watered the plants________?—Yes,I have.
—How long has he________the books?—For about one week.
—Can you give me some information about vacation trips?—Why not________going to Hainan Island?A.considerB.mindC.keep