47．A．has been checked                                     B．have been checked

C．has checked                                               D．have not been checked

46．A．keep                    B．to get                         C．got                        D．keeping

45．A．for ever               B．just now              C．right away              D．ever since

44．A．washes                B．to wash                C．washing                 D．washed

43．A．give                    B．take                     C．change                   D．turn

42．A．are used to           B．used to                 C．used                    D．have used to

41．A．to stay out of                           B．to stay off

C．to stay over                              D．to stay away from

40．A．houses                  B．droppings（粪便） C．eggs                      D．food

39．A．mean                   B．see                      C．think                     D．realize

38．A．to                       B．for                      C．at                          D．in