根据内容用适当的句子补全对话。
A: Hi, Li Hua. Our summer holidays are coming. What are you going to do?
B: 1 _______________________________.
A: Visit Shanghai? For the World Expo in Shanghai.
B: Quite right.
A: You are so lucky! 2 _______________________________?
B: By plane, I know you often go there. Could you tell me something about it?
A: Of course.
B: What's the weather like there?
A: It is very hot. You'd better take a pair of sunglasses and some cool clothes.
B: Thank you for your advice. It's said the World Expo is quite wonderful. Would you like to go with me?
A: I'd love to, But I am afraid I can't. My grandfather is ill. I have to look after him.
B: 3_______________________________. I hope he will be better soon.
A: I hope so. By the way, when are you leaving for Shanghai?
B: Next week.
A: 4_______________________________! Bye-bye
B: Bye.
