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.