初三英语补全对话A Hi,Bill.You look unhappy?What's up?B -------------

初三英语补全对话A Hi,Bill.You look unhappy?What's up?B _____________.I want to buy some books,but I'm too busy.A _______________________?B But I''ve never shopped online before.A ___________________.I want to buy a book ,too.B Really?That's good.When shall we shop online?A How about this afternoon?B No problem.________________________.A Yes,it is simple.Just follow the instructions.B _____________________!Next time,I can buy other things online