Where do cars get their energy from? For most cars,the answer is petrol.   21   some cars use  electricity . These cars have   22   motors that get their power from large batteries. In   23   ,there are even cars that have   24   an electric motor and a petrol motor. These types of cars are   25   hybrid (混合) cars. 
　　Most people tend to think of electric cars as a new    26    ,but they have been around for a long time. In the   27    19th and early 20th centuries electric cars were common because the technology for petrol engines was not very advanced. But   28   the petrol engine became easier to make and more powerful,this type of engines became the most   29   . Interest in electric cars was high in the 1970s and 1980s because   30   became very expensive. Recently,electric cars have again become well-liked because people want cars that pollute   31   . 
　　Electric cars are better than petrol cars   32   several ways. The biggest benefit is reduced pollution. In areas    33    there is a high percentage of electric cars, pollution is not that serious. The second benefit of electric cars is a   34   in the dependence on foreign oil. Several countries don ' t want to   35   on oil from other countries. Since electric cars can run on electricity from coal or nuclear power stations , there is less need to import oil. 

Passage One 

　　 As we recently discovered , there is a Stepmother's Day , though it is not on any official holiday calendar. So,it would be safe to assume that there is a similar day for stepdads,too. Right? Well, it depends on what you read. A Google search brought up posts that say , for example, "It's on father' s day-father' s day is for fathers , step-fathers and people who are like fathers to you-it's a day for making father figures feel special. " Further searching found a Stepfather' s Day Facebook page that says , " The unofficial Stepfather's Day is the fourth Sunday of June. " Unfortunately, as of the publishing of this article , only 30 people have "liked" the page. Considering that studies show 3.3 million men , or 11.1% 0f U. S. fathers,live with at least one stepchild , that's only a drop in the ocean. 
　　It' s interesting to note that there is a National Grandparents '  Day. President Jimmy Carter signed it into law in 1978. Law ! While grandparents are undoubtedly special people in our children's lives,they are often seen as the most loving family members. But what about the stepparents? The stepparents are the ones who are often the outsiders, the ones who have to endure the hurtful " You're not my dad ! " or "You' re not my mom! " And yet they never give up. They do their best to overcome the inherent challenges of stepparents and be role models for their stepchildren. These unsung(未被颂扬的 ) family heroes deserve " official" days of honor. Perhaps if we are loud enough , President Obama,who had a stepfather himself, will sign into law National Stepmother's Day and National Stepfather's Day. 
　　Are you with me? Follow me and get your voice heard. How cool it would be if we could make this happen! 

( At a bus stop)
 Mary : We couldn't ask for a better day, could we?
 John: I know.   56   . I love this time of the year.
 Mary : This bus seems to be running late , doesn't it?     57    ?
 John : I've been here for at least ten minutes.
 Mary : Ah , here comes a bus !
 John: Oh good. Wait!    58   . That bus goes downtown.
 Mary : Well,it looks like we ' ll be waiting a little longer.    59    ,I guess.
 John : Oh,l' m afraid you have no time for that. Here ' s our bus.
 Mary : Oh great ! I thought it would never come.
 John:   60   !
 Mary : You too.