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20. As far as we know，it took him more than a year to write the book.

21. It has been proved that every substance，no matter what it is，made up of atoms.

29. It is true that we must redouble our efforts;otherwise we cannot catch up with the developed countries.

30. I take it for granted that they will support this idea. I regard it as natural that they will agree to this idea.

31. In a certain sense ， a successful scientist is a person who is never satisfied with what he has achieved.

32. It is a common saying that man who has a settled purpose will surely succeed.

33. The oceans do not so much divide the world as unite it.

34. It can be said that without knowledge of science and technology，it is impossible to build socialist modernizations.

35. There is no denying the fact that the new management method has greatly increased the production.

36. Now in China，more and more families can afford to buy high-grade goods，such as washing machines，TV sets，videocorders.