Đọc chọn đáp án đúng để hoàn thành đoạn văn. Bicycles The bicycle is one of the simplest yet most useful inventions in the world. What is most surprising is that it was not (1) …………. earlier, although the great inventor Leonardo da Vinci had drawn picture for bicycle and also for flying machines and some other things. Those things were not produced (2) ………… long after he died. A person riding a bicycle use (3) ………….. energy to make the bicycle move, and there is no pollution at all when you are riding. Even so in developed (4) …………., most people don’t travel to work by bicycle. It is not because the bicycles are expensive or people feel (5)………….if they ride to work. It’s because (6) ………… cars on the roads becomes larger. It certainly becomes (7) ………… to ride a bicycle. As a result, more people put their bicycles away and go to work (8) ………… their cars, and in this way, the situation is made more serious. (9) ………….. the best way to make riding safer and more popular is to create paths only for bicycle and to make (10) ………….. so difficult and expensive for drivers to take their cars into the city that they will go back to use their bicycles. 1. A. had B. used C. invented D. ridden 2. A. before B. when C. since D. until 3. A. much B. quite a lot of C. very little D. many 4. A. world B. countries C. land D. earth 5. A. lucky B. glad C. sorry D. tired 6. A. the number of B. a number of C. this kind of D. all kinds of 7. A. safe B.more dangerous C. much D. popular 8. A. by B. in C. use D. drive