3．--Do you know his parents?     --Yes，they _________ English teachers in our school．

A．are all                 B．all are                  C．are both               D．both is

2．After discussion（讨论），we decided _________ Japan for vacation．

A．in                       B．at                        C．on                         D．of

1．Her mother is ill and she is looking _________ her at home．

A．for                      B．at                        C．about                     D．after