21.  The most important role lies in the administration.

22.  The consumer also play an essential role in the compaign .

23.  But, at the same time, fake commodities are playing a more and more harmful role.

24.  College students are supposed to play important roles in the society after their graduation.

25.  To make sheet, first mix round flour and water in certain proportion to make it a stretchy solid state, and split it into small pieces, then role them into round shaped sheets with a rolling pole.

26.  Of course, the latter only lays a minor role.

27.  What is more, lantern plays an important role in this festival.

28.  Bicycles play an important role in the life of the Cantonese.

29.  In a word, modernization plays a very important role in our building socialism country.

30.  The teacher plays no doubt a certain role, but his main task is to act as an observer, or an instructor, at the very most, who can not replace the student himself and finish the process of cognition for him.