从方框中选择适当的句子补全对话，有两项多余

Betty: Hello, Lingling.
Lingling: Hi, Betty.
Betty: ____________
Lingling: I am going to do my homework. ____________
Betty: I am going to have a piano lesson.
Lingling: What are your plans for Sunday morning?
Betty: Sunday morning? I am going to buy some clothes. Would you like to go with me?
Lingling: ____________ ____________
Betty: Let’s meet at the gate of the post office.
Lingling: OK. ____________
Betty: At eight o’clock in the morning.
Lingling: All right. See you then.