48. If you want to enjoy the paintings for a long time , you should visit the museum

on        .

A. Monday                   B. Wednesday               C. Saturday           D. Sunday

46. A. challenges           B. experiences        C. happiness          D. sadness

45. A. was seen             B. was known        C. was knowing          D. was seeing

44. A. careful                B. interesting         C. different            D. unsuccessful

43. A. him                    B. himself             C. he                     D. his own

42. A. made                  B. kept                  C. served               D. encouraged

41. A. While                 B. During                     C. For                   D. Since

40. A. on                      B. in                            C. to                            D. from

39. A. began                 B. finished             C. found                D. passed