21.  People in west eat too much fat and sugar.

22.  It is the largest bridge in the world.

23.  Its steel ropes are so long that they can circle the earth four times in all.

24.  In the 1990's, the development of computer took on a very high speed.

25.  In this side man controlled the computer.

26.  In this side, computer controlled man.

27.  The last self-study hours in the evening this Wednesday , wrote down the awkwardest position in the history of my class.

28.  And a big play-ground in it .

29.  Now there are thirty-six classes, one thousand eight hundred students, and more than two hundred teachers in it.

30.  As we all knew, the great flood had broken out in Conghua and Huadu.