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.