IV. Read the following article and choose the best option A, B, C or D for each question. Traveling by bus has both advantages and disadvantages. The first benefit of buses is the cost. People can save a lot of money when they travel by bus because it is a type of public transportation. People only need to spend about 7,000 to 10,000 Vietnam Dong for each route. For example, in Hanoi, it only costs 7,000 Vietnam Dong to travel around by bus. Second, buses are more friendly to the environment because they burn little gas and cause fewer emissions to the environment. However, this mode of transport also has many disadvantages. First, it is not as convenient as private transportation. For example, there are usually a lot of passengers on a single bus during rush hours. Passengers cannot enjoy their personal space when they are on the bus. Second, buses sometimes avoid locations with special geographical characteristics. Finally, services on buses are not quite comfortable for travelers. It may get exhausting because of crowdedness or noises of passengers and traffic vehicles. 21. In Hanoi, a passenger needs to spend ____ to travel by bus each time. A. about 7,000 to 10,000 Vietnam Dong B. more than 10,000 Vietnam Dong C. more than 7,000 Vietnam Dong D. 3,000 Vietnam Dong 22. When we compare buses with other vehicles, buses ____. A. cause the same emissions B. burn more gas C. cause less damage to the environment D. cause no emissions 23. During rush hours, ____. A. traffic can be very crowded B. bus passengers cannot enjoy their private space C. buses get crowded because passengers love traveling by buses D. buses are not as convenient as private transport 24. All of those are the reasons why services on buses are uncomfortable, except for ____. A. loud passengers B. the crowdedness on a bus C. noises from other vehicles D. the crowded traffic 25. This article mainly writes about ____. A. the advantages of buses B. the reasons why people should travel by bus more C. the advantages and disadvantages of buses D. the comparison between buses and other personal vehicles