—I'm not sure. Unless your father____________ his new work.

—Yes, it ____________every day.

    Olive oil(橄榄油) is probably most(广泛地) used for cooking. It is(制造) from fresh olives. Olive oil has been a main food in the Mediterranean(地中海) countries for thousands of years, and some olive trees which are hundreds of years old still(生产) fruits. The workers pick them and then they are(加工).

    (几乎) everyone knows that olive oil is good for our health. But what most people may not(意识到) is that olive oil is used for a lot more than just food. People make soap out of it,(磨光) diamonds with it, and burn it for light.

    These days, more and more people all over the world are discovering that olive oil may be the best oil for cooking, such as(德国), America and so on. So most of them use it for(日常的) cooking. And Italy is(闻名的) for the olive oil. Spain produces the most olive oil in the world, followed by Italy and Greece.

    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.