Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks

They call New York "the Big Apple". Maybe it isn't exactly like an apple, but it is certainly very big. There are too many people, that's the problem. The streets are always full (27) _________ cars and trucks, and you can never find a place to park. If you have enough money, you can take a taxi. New York cabs are yellow. They look all the same. But the drivers are very different. Some were born and raised in New York, (28) ___________ many are newcomers to the United States. A few drives slowly, but most go very fast. Cab driving is a difficult job. It can be (29) ________, too. Thieves often try to steal the drivers' money. Drivers sometimes get hurt. If you don't want to take a taxi, you can go by bus or you can (30) ____________ the subway. The subway is quick, and it's cheap, but parts of it are old and dirty. Lights don't always work and there are often fires on the track. On (31) ___________ subway lines, there are new, clean, silver trains. But you can't see the color of the old trains easily. There is too much dirt and too much graffiti, inside and outside.