根据短文内容和首字母提示，在文中空白处填入一个适当的单词，使短文完整、通顺。

Transportation is becoming more and more convenient, though some people like to walk or bike to work. In fact, they go to work in different w . The ways depend on where they live and what they like. Some people walk to work because they live n their workplaces. Some people go to work by bicycle because they live farther a , or they like riding bikes and they think it is good for their h . But some people in the cities go to work by bus or s , because they are much f . It is also interesting to t the bus or subway. And some people take trains to work. Today more and more people have private(私人的) cars. But that may cost too m money. In some places of China where there are r and lakes, people even go to work by boat, because water is around their houses. That m be a lot more fun than taking a bus. Will people go to work by plane? I think so, if it is necessary.

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