49．A．same                   B．exactly                C．difficult                 D．easy

48．A．of                       B．to                        C．about                     D．with

47．A．At first                B．At last                 C．At the end              D．By the end

46．A．quickly                B．faster                   C．slowly                   D．more slowly

45．A．when                   B．what                    C．where                    D．how