--- Do you hear someone _____ on the door? --- Yes. It is late at night. Who can _____ be?
–Who is _____ English teacher, Jim? --Mr Wang teaches _____ English.
–Why are you in such a hurry, Mike? --There _____ an NBA basketball game in ten minutes.
I think _____ of the materials I listen to at the beginning of the exam _____easy.
Now, everybody, please turn to Page _____ and look at the _____ picture.
–Shanghai is the city ______ the 2010 world Expo is held. --So it is a city____ most of us want to vist this summer.