As is known to all Americans, Harvard University was _______ in 1636,with a history of more than 300 years,
—I was worried about my math,but Mr.Brown gave me an A. —______________. A.Don’t worry about it. B.Congratulations! That’s a difficult course. C.Mr.Brown is very good. D.Good luck to you!
Mother was busy washing dishes ________________ Father was watching TV.
Shanghai is the first city in the world _____________ a high-speed maglev train,from the city to Pudong Airport.
—Is Tom still smoking? —No.By next Saturday he _____________ for a whole month without smoking a single cigarette.
While reading an interesting story book in my room,______________.