We can’t have lunch at the restaurant, because _________．

To save class time, our teachers has _____ students do half of the exercise in class and complete the other half for our homework.

—Do you have   ready for the graduation ceremony，Ted?—No，we still have to find a famous speaker.

Of all the books on the desk,    is of any use for our safety．

 Both teams were in hard training, _______ was willing to lose the game.