选择合适的句子，使对话的句意完整。
A: Hi, John.
B: Hello, Susan. It’s a great surprise to see you here. 1________________
A: I’m on a holiday trip in London here. 2_________________
B: I came to do some shopping in London on weekends and now I am ready to be back to Brighton. It’s not far from here.
A: 3 ________________
B: No, I’m not. And besides, I often come to visit my friends here.
A: 4 _________________
B: I’m afraid not. I have to return to have classes in the afternoon.
A: Well, it doesn’t matter. I can go sightseeing myself.
B: Sorry. I have to say goodbye to you. 5 _______________
A: I think I will. Thank you for your best wishes. Bye-bye.
