Yesterday the teacher told us that the earth ________around the sun.
—Susan, did Prince William get married to Kate Middleton on April 29, 2011?—Yes, he_____for nearly a week.
Why not_____an English club to practice_____English?
—What’s _____most useful invention in the 20th century? —_____ computer, I think.
— Tom, you are going to buy a new flat here, aren’t you?— Yes, but I can’t _____an expensive one.
—Open the window, please. —Certainly. Which one? _____ beside the door?