给问句选择正确的答语。

⑴What is he doing ?                                    A、Sorry , I can't .

⑵Who can help me ?                                   B、She's at the supermarket .

⑶Am I going to have a birthday party ?     C、I'm fine , thank you . And you ?

⑷Where is your mum ?                               D、Yes , you are .

⑸How are you ?                                          E、He's getting on the bus .