Alice：  You seem to be absorbed(全神贯注) in the magazine, David.
David： It is the New scientist, __________ (deliver) to me this morning. Honestly speaking, I am fascinated(着迷的) by the magazine.
Alice： Are there articles or stories about the latest__________ (science) breakthrough?
David: Sure. I am reading an article______________ (introduce) a new invention --- the “flying car”.
Alice: That sounds interesting. Can you explain to me ____ the “flying car” works?
David: Yes. The car has four wheels and two wings that can be folded. So it can _________ be driven  on the road or flown at a speed of 110 miles per hour, just like a plane. When the roads are crowded, _____ is often the case now,  you can fly it and easily reach your destination. Besides, it uses electricity instead of petrol, so it’s ________________ (environment) friendly
Alice: Sounds great! This kind of car will make our lives ________  (easy) and more comfortable. By the way, is the “flying car” on the market yet? Can I buy ___ now?
David: I’m afraid not. The car   ____________ (try) out at present and it still needs to be improved.
Alice： I bet it is very expensive.
David： It does cost a lot of money, but scientists are working hard to bring down the price.