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СÌâ2:The new words are helpful to you. Try to know all of them by h______________.
СÌâ3:I often w_________ to school instead of taking a bus because it¡¯s quite near my home.
СÌâ4:I¡¯ve lost my watch. I can¡¯t f___________ it anywhere
СÌâ5:--Are you free to come here tomorrow afternoon?
--Sorry, I¡¯ll ve very b_________ at that moment.

СÌâ1:pair
СÌâ2:heart
СÌâ3:walk
СÌâ4:find
СÌâ5:busy

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   We are now living in the modern society. Most of the energy we use for heating, lighting, transportation and manufacturing (ÖÆÔìÒµ) comes from fossil (»¯Ê¯) fuels. These are carbon-based fuels from oil, coal and natural gas. When we burn these fuels we release heat which p__СÌâ1:___ the energy.
There are three main disadvantages to using these fuels. Firstly, they are causing climate problems because of the G_СÌâ2:___ Effect. When we burn fossil fuels they produce carbon dioxide which causes global warming. Secondly, when we have used up all our coal, oil and natural gas, we will have n__СÌâ3:__ left to burn. Thirdly, they are not very efficient. The internal combustion engine (ÄÚȼ»ú) that we use in most cars, trucks and buses, for example, is only about 14% efficient.
Scientists are working on another fuel¡ªhydrogen. There are a couple of advantages to using hydrogen as a fuel. Firstly, because two-thirds of the e__СÌâ4:__ surface is water and water is made of hydrogen and oxygen. There is an almost unlimited supply of hydrogen. Secondly, burning hydrogen does not cause global warming. Thirdly, it is much more efficient than carbon-based fuels.
Unfortunately there are problems with hydrogen at the present time: there is the problem of separating (·ÖÀë) it from water c_СÌâ5:___, and there is the difficulty of storing it. It can be stored under pressure but high pressure tanks are far from safe. It can also be stored as a liquid but only at extremely low temperatures. It seems likely, therefore, that there will have to be a completely new technology before hydrogen replaces fossil fuels. S__СÌâ6:___ these problems is an urgent (¼±ÆȵÄ) matter. Although China, India and Australia have huge amounts of cheap coal, and there are still l__СÌâ7:___ oil and gas reserves(´¢²ØÁ¿) elsewhere, the effects on the planet¡¯s climate will be bad if they are used.

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