69．It can be inferred from the passage that the author thought the exercises in the book were . (A)popular (B)useful (C)scientific (D)creative

28．—It took me ten years to build up my business , and it almost killed me . —Well , you know what they say . . (A)Thee is no smoke without fire (B)Practice makes perfect (C)All roads lead to Rome (D)No pains , no gains