—Sorry,I didn't.But now I know parking here.
Suppose you find a bright yellow bike on a street corner in the city. You hop on(跨上)it and1. But wait-isn't this stealing? No, it isn't.2shouts," Stop! Thief! "That is3this free ride is just fine with the city.
You4find hundreds of free yellow bikes in some US cities. The idea began in Portland, Oregon, in 1994. People saw a need for5transportation, and they wanted to help6pollution. So, to get citizens(市民)7their cars and onto pollution-free bikes, they8the Yellow Bike Project.
The9bikes 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 work10to school. Then, they leave the bike for the11rider. There have been times when bikes have been stolen, but most people12the rules, because they think it is not wise to13the bike that's already free.
Portland's14was quickly loved by a lot of people. Within two years of its start, similar programs were15in cities in six other states.
When we think of paper, we think of newspapers and books. But there are many other uses. Only half of the world's paper is used for books and newspapers.
Paper is very good for keeping you warm. You have perhaps seen homeless men sleep on a large number of newspapers. In Finland, it is sometimes-40℃ in winter. The farmers wear paper boots(靴子)in the snow. Nothing could be warmer.
Each year, more and more things are made of paper. We have had paper cups and plates for a long time. But now we hear that chairs, tables, and even beds can be made of paper. Besides paper boots and shoes, you can wear paper hats, paper dresses, and paper raincoats. When you have used them once, you may throw them away and buy new ones.
The latest use of paper seems to be paper houses. These are not small houses for children to play in, but real, big houses for people to live in. You can buy a house with three rooms for about 500 dollars. You can put it up by yourself in a few hours, and you can use it for about five years.
—You know they __________by the hard-working cleaners every day.
—__________a cat. __________ name is Mimi.