21.  English books can help us put this in an unrelated series of words within the entire article, and can help us better control of their usage.

22.  While you can increase your vocabulary by reading books within your favorite genre, it has been shown that you will increase your vocabulary even more by reading books that are not in your genre.

23.  Hong Kong will thereby be restored to China and within the framework of "one country two systems", it will continue to have a strong identity of its own, and be an important international partner for many countries in the world.

24.  There are too many similar contests held to earn money within a short time.

25.  Maybe opponents hold similar belief with that of 'the Beauty and the Beast' that 'not to be deceived by appearances, for beauty is found within'.

26.  As the saying goes 'Wasting your time is slowly committing suicide ' In my opinion , we should do some meaningful things within our short and limited lifetime.

27.  Early in Jobs's career, journalists were wary of stepping within range of his "reality distortion field, " his perceived ability as a showman to make products seem better than they actually were.

28.  Fewer women are asked to stay at home to be a housewife; instead, they have got more chances to compete with men in many areas, within which the career field is a typical one.

29.  Everything should be within limits so that society and government ought to set limit to beauty contest's quantity.

30.  Jobs resigned his post as chairman of the board and left Apple within months.