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 .