great scientist Yuan Longping is! He spent all his life on the research of rice.
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_______ of the students in our class _______ interested in micro blogs (微博) on the Internet.
_______ great fun it is to play games on _______ QQ!
----Kathy, what do you think of my painting? ----_____________.
----I came to your office yesterday morning, but nobody was in. ----Oh, we__________ a meeting in the meeting room.
Hurry up! The film for ten minutes.