Read the followingpassage 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.

The human civilization underwent many changes and development with the passage of time. In course of time, cities became the major centers of livelihood. A city has large population compared to a town and a village. Life is full (21)______ activities in a big city. It is a center of education, trade and industry, (22)______, etc. Life in a big city starts early in the morning. School children, office-workers, and others fill (23)______ roads, bus-stops and the vehicles. The market places get crowded with people. Life in the city has certain charms. The factories and the industrial centers give employment to thousands of people. Those (24)______ work hard in cities rise in life. Here, neighbors live like (25)______. Everyone finds himself in hurry and worry. The atmosphere is polluted. There is competition in every sphere. However, cities add to the economic development of a nation.