The students are doing some cleaning. Some are sweeping the floor, ________ are cleaning the desks and chairs.

Mr. White always expected his son _______________ anactive part in the classes.

I wonder ________ they finished so many different jobs in such a short time。

How do you find the match between Spain and Switzerland?—It’s ！ Powerful Spain lost the game by 0∶1.

Either the dean or the principal______ the meeting