阅读下面短文，体会其中的过渡性词语。
假设你是星光中学的李华，将参加主题为“Let’s Ride Bicycles”的英语演讲比赛，请撰写一份演讲稿，内容主要包括：
1．目前汽车造成的空气污染和交通堵塞等问题；
2．骑自行车的益处，如节能环保、有利于健康、是一种低碳的生活方式等。
Good morning，everyone，
I’m Li Hua from Xingguang Middle School.The topic of my speech is“Let’s Ride Bicycles”．①As is known to all(众所周知)，with the improvement of people’s living standards，cars have become a popular means of transport，bringing great convenience to our life.②However(然而)，they have also caused some problems such as air pollution and traffic jams.③How can we solve the problems then(那么我们怎么才能解决这些问题呢)?
④As far as I’m concerned(据我所知)，riding bicycles is a good solution.For one thing，bicycles don’t need any petrol and they are energy-saving.For another，bicycles are environmentally friendly because they won’t give off waste gas.⑤What’s more(此外；而且)，riding bicycles is a good way for us to exercise and it is beneficial to our health.⑥Therefore(因此)，let’s take the responsibility to build up a low-carbon city by riding bicycles.Come on and join us!
Thank you!
