初二缺词填空

初二缺词填空
Small cars may take the place of big cars in the future. There is s_______ for only people in such a car. If everyone d________ such a car, there will be less pollution f______ the air. There will be also be more space for p__________ cars in cities, and streets will be less crowded. The little cars will cost m________ less. Driving will be s_________, too, as these little cars go only a few kilometers per hour. If big cars are still used along with the small o______, two sets of roads will be n_________ in the future. Some roads will be used f________ the big, fast cars and the o__________ roads will be used for the slower small ones