1 . Suppose you find a bright yellow bike on a street corner in the city. You hop on (跨上) it and _______. But wait — isn’t this stealing? No, it isn’t._______ shouts, “Stop! Thief!” That is _______ this free ride is just fine with the city.

You _______ find hundreds of free yellow bikes in some US cities. The idea began in Portland, Oregon, in 1994. People saw a need for _______ transportation, and they wanted to help _______ pollution. So, to get citizens (市民)_______ their cars and onto pollution-free bikes, they _______ the Yellow Bike Project.

The _______ bikes are painted bright yellow and placed throughout the city. People can hop on the yellow bike and ride to run errands (短程差事), to work ________ to school. Then, they leave the bike for the ________ rider. There have been times when bikes have been stolen, but most people ________ the rules, because they think it is not wise to ________ the bike that’s already free.

Portland’s ________ was quickly loved by a lot of people. Within two years of its starts, similar programs were ________ in cities in six other states.

2 . Bicycles are very popular in China. In our country you can see bicycles almost everywhere. When you walk on the road, you will find a lot of people riding bicycles to schools, shops and anywhere else. Therefore, China is known as “the kingdom of bicycles”. In China, many families have one or two bicycles. Compared with (与……做比较) cars, bicycles have many advantages. First, they are much cheaper than cars. Most Chinese can’t afford cars, but they can afford bicycles. Second, bicycles are small enough to park anywhere, while cars need a larger piece of land to park. What’s more, with lower speed, bicycles are safer than cars. However, bicycles also bring some problems. Some riders don’t obey the traffic rules and some riders don’t think about others safety. So they ride too fast. During the rush hour, too many bicycles may cause traffic accidents. We still have a long way to solve the problem.