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The number of students in our school ________about 30,000 and ________them study hard.

As a result of destroying the forests, large ____ of desert ____ covered the land.

What the science teacher does and says ____ of great importance to college students. 

Having ________ every night is very important for your health.

The number of people in their class _______51.

Greatly moved by the movie, __________.

John as well as his good friends often          skating in winter．

The Arabian Nights _____ well known all over the world, in which many a story_____ interesting and instructive．

When I was in primary school, I was told that the earth ______around the sun.

Tom along with his classmates ______ for the coming exam.