The computers made by our company sell best, but several years ago no one could have imagined the role in the markets that they _________.

—How long do you think it is ________ he arrived here?　　　　—No more than half a year, I believe.　　  

. All of the guests ___________ by 9 o’clock , but the host _____________ until 15 minutes later .

Teenagers _____their health because they play computer games too much.

—Guess what! We’ll have a chance to visit our sister school in Denmark this summer!—How nice! You ________ a different culture then.