支撑句/拓展句（Supporting / Developing Sentence）
Bicycles are very popular in China.（主题句）Almost every family in the city has two or three bicycles.（支撑句1）During the rush hour，you can see that thousands of people——man and woman，old and young——ride their bicycles to work and study.（支撑句2）That is why China is called“the kingdom of bicycle”.（结论句）
We should know that he who seizes the right moment is the right man. If a farmer doesn''t sow his seeds in spring， he would be definitely unlikely to get crops in autumn. If Hellen Keller had rejected her teacher''s help,she might have been as ignorant as any other inborn blind. All these add up to a fact that a wise man never fails to grasp any chance at the right moment.
Opportunities are available to everyone. Just as a western saying goes,“Every dog has its day.” everybody enjoys opportunity sometime in his life. In fact,we just can''t find anyone in the world who never has his chance to succeed during his life.
During holidays,the traffic in big cities is always particularly heavy. This is mainly because most citizens don''t have to work in these days and they ride their bicycles to the streets to do some shopping. Farmers in the country also flood into the cities by bus or by their own motorcycles. The streets are full of buses,taxicabs,minibuses and pedestrians. As a result,traffic jams often occur.
There are several reasons for the increase. Firstly,the open policy being carried out in the state has enabled many foreign laborers to come and work there. Secondly,the beautiful scenery of the small island has attracted many tourists and some of them have been permitted to settle there. In addition,the government may not have realized the necessity of controlling population.