There ______ quantities of apples in the basket and there was ______ milk in the bucket.

Twenty years _____ passed since I came to this school, but I feel twenty years _____a short time in my life. 

 —________ two months enough for the project to be finished?—I am afraid not. The professor is ill and only after he recovers ______ go on with it.

Only 16 percent of China’s area ____ covered with forests, so ____of us should protect trees. 

All possible means ____, but nothing can prevent the buildings ____.