11.  Hong Kong and Macao can come back to china because of his theory of "Two system in one country".

12.  A specical system in learning English come into being after several years experience of learning .

13.  Just for these reasons, we should reform the old economic system and open our door to the world.

14.  The reason lay in two : First, the economy system didn't fit in with the development of our country.

15.  It reformed the past economic system in our country and opened the door of our courtry to bring into anvanced sciente and technology.

16.  Secondly, the development of medical system could cure more disease than before.

17.  Firstly we should establish a good system of law.

18.  For a factory, if it buys the fake commodities and what it need is the most important thing in the production systems, the loss May be countless.

19.  So we must have a severe control system.

20.  Second, we should produce a good system against fake commodities.