In the old days, Vietnamese roads were seen with bicycles and a few trucks. Now they are full of a variety of vehicles. The Vietnamese carry a huge load of a variety of goods up to over one hundred kilograms, especially during the war. Time has gone by and fewer bikes are visible in the street. In big cities, many people think that bicycles belong to the inferior classes and seem unfashionable . That is why people often find it hard - psychologically and physically - to park their bikes when going to a modern cafe or shopping malls. Motorbikes are the main mode of transport in Viet Nam, with 24 million of them in a country of 87 million people in 2009, one of the highest ratios in the world. More motorbikes of all brands have dominated the road. The mobility which motorbikes provide is so crucial to workers in big cities. Some youths try to show off with expensive motorbikes of famous brands. Almost anything can be transported on a motorcycle. The loads include baskets of fruits, tree trunks, live pigs, flocks of live ducks and stacked crates of raw eggs. Two thirds of Viet Nam's population of 85 million arc under 30, and the motorcycle has become the center of youth culture. 17. Nowadays, bicycles…………….. A. are looked down on by some people B. become more visible in the streets C. are used in the war D. can’t be parked outside a modern cafe 18. The most important thing that makes motorbikes become the most popular means of transport in big cities may be that . A. the Vietnamese often carry a huge load of a variety of goods B. a large number of young people own motorbikes C. there are expensive motorbikes with famous brands D. young people can easily move around in big cities by motorbike 19. According to the passage, all of the following are true EXCEPT that . A. the density of bicycles is still high B. Viet Nam has one of the highest vehicle densities is the world C. motorbikes are very popular among young people D. bicycle was used as a means of transportation during the war 20. We can infer from the passage that . A. there are some regulations about transport by motorbike B. the majority of Viet Nam’s population is young C. expensive motorbikes of famous brands are dominating the road D. cycling has become fashionable recently 21. The word “dominated” in paragraph 3 is closest in meaning to A. blocked a place B. been the most obvious C. controlled over a place D. played a role