55 A who B what C where D which

56 A shape B tumor C thing D group

57 A sick B rich C mild D active

58 A country B body C Cell D place

59 A spreads B turns C moves D travels

60 A said B supposed C known D called

61A In case B Because C Unless D If

62 A can B must C should D need

63 A before B after C once D While

64 A down B by C up D forward

65 A fired B married C joined D upset

参考答案：

51 A 52 B 53 C 54 A 55 D

56 B 57 A 58 B 59 A 60 D

61 C 62 A 63 A 64 C 65 B