For the four sentence paragraph below, sentences S1and S4 are given. From P, Q, R and S, select the appropriate sentences that can fit S2 and S3, respectively. S1: The economist Robert Solow noted that “there is no shortage of talk about the middle class” — and that was 10 years ago. S2: S3: S4: These definitions range from a wholly subjective set of aspirations to a highly specific measure of household income, and everything in between. P: There is nothing approaching a universal definition of a middle class. Q: All of this requires a reasonably clear idea of who we are talking about. R: In the final analysis, how can the quality of life of the middle class be improved? S: However, there is a kaleidoscopic range of definitions.