1、Using bicycle contributes greatly to people's physical fitness as well as easing traffic jams.
2、This issue has caused wide public concern.
3、 Environmental experts point out that increasing pollution not only causes serious problems such as global warming but also could threaten to end human life on our planet.
4、Despite many obvious advantages of bicycle，it is not without its problem.
5、This view is now being questioned by more more people.
6、In view of such serious situation，environmental tools of transportation like bicycle are more important than any time before.
7、From what has been discussed above，we may safely draw the conclusion that advantages of bicycle far outweigh its disadvantages it will still play essential roles in modern society.
8、Although many people claim that，along with the rapidly economic development，the number of people who use bicycle are decreasing bicycle is bound to die out. The information I've collected over the recent years leads me to believe that bicycle will continue to play extremely important roles in modern society.
9、Bicycle can't be compared with other means of transportation like car train for speed comfort.
10、 There is a general discussion these days over education in many colleges institutes. One of the questions under debate is whether education is a lifetime study.