请在下面的10个单词和短语中挑选正确的一个进行填空。 in mind // although // on // designed // like // which // popular // fuel // parking spaces // electricity Although around the world are planning to make cars that are smaller, use less fuel and do not damage the environment. At auto shows around the globe, car producers are presenting what they have 1 . General Motors has already displayed one of its prototypes. It is call P. U. M. A., 2 means Personal Urban Mobility and Accessibility Vehicle. It looks 3 a cart, has two batteries and seat for two people. While GM's car may never be produced, other car makers have already made mini-cars that you can buy. Mercedes' Smart car has been 4 in Europe for some time. Chrysler's GEM Peapod and Toyota's IQ are two small cars that have been specially 5 for city traffic. Many people want to buy small cars because they save 6 . That means saving money on petrol plus being able to find 7 more easily in crowded cities. Carmakers are also spending money 8 research to make alternative-fuel cars. Maybe one day, most of us will drive biodiesel (生物柴油), hydrogen (氢) or solar-powered cars. Hybrids are cars that are already on the market today. Toyata and GM already produce hybrid cars, trucks and SUVs that run on petrol and 9 . Other companies, like BMW, have made cars that use hydrogen and electricity. 10 such cars are still too expensive to produce in large numbers, carmakers are continuing to improve them and make them cheaper.