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Read the following passage and mark the letter A, B, C, or D to indicate the correct answer that best fits each of the blanks from 21 to 25.

Life in the concrete jungle can be both exciting and challenging. The roads are often congested (21) ________ both cars and bicycles. The city is bustling with a variety of shops, libraries, shopping centers, and restaurants, but these places (22) ________ are often full of people. Sometimes, pickpockets are a problem. This is a part of city life that we should be careful about.

To escape the traffic jams, many city dwellers (23) ________ the subway, train, or underground metro. These public transport systems provide a quick and efficient way to get around. In fact, lots of people (24) ________ it, and many people still love it. In fact, lots of people from other cities (25) ________ it and feel like there are more chances to enjoy life.

21. A. full
B. situated
C. available
D. packed

22. A. amenities
B. entertainments
C. use
D. centers

23. A. however
B. but
C. therefore
D. although

24. A. excited
B. exciting
C. excitement
D. exhausting

25. A. love
B. like
C. enjoy
D. feel