四、Complete this introductory paragraph with phrases from the box. Not all phrases will be used.(0.5*4) (24)________________________ , last year (25) ________________________ in the US wasted 42 hours stuck in traffic. Indeed, (26) ________________________ , such as Washington, D.C. and New York, it was closer to 80 hours. Not surprisingly, many smart people have begun to think about (27) ________________________ this traffic problem.