Mark the letter A, B, c, or D to indicate the correct answer to each of the following questions. TỚ CẦN GIẢI CHI TIẾT Ạ 30. Many commuters struggling to work through the rush-hour ________ ask ‘Is it worth it?’ A. Congestion B. vehicles C. roads D. accidents 31. It is, perhaps, the daily stresses and _________ of the city which make life there a matter of survival rather than of enjoyment. A. Depresses B. strains C. demands D. challenges 32. Most cars nowadays are íĩtted with a security __________ of some kind. A. Motor B. gadget C. tool D. device 33. The greenhouse_______ takes place when certain gases in the atmosphere trap sun’s heat. A. Emission B. gas C. effect D. affect 34. Pollution and heavy traffic are common problems in ___________ cities. A. Cosmopolitan B. modem C. metropolitan D. overcrowded 35. Millions of people around the world still live in poverty. They are struggling every day simply to _______ . A. Get up B. get by C. get on D. get round