．Although it         in the desert most of the year, people still live there．

At present , the butter factory is still polluting the river though it _____to stop.

In order to improve your English, you’d better ____________ the important points in your notebook in class.

—I hear Jane has gone to the Holy Island for her holiday.—Oh, how nice! Do you know when she______________?

It is most instructive lecture that I _______ since I came to this school.