补全对话。

A. It's 11 o'clock. B. What's the time? C. No, it isn't. D. It's dinner time.

Mum: Sam, what are you doing?

Sam: I'm looking at the time.

Mum:

Sam: It's 7 o'clock.

Mum: Right. It's 7 o'clock in Beijing.

Sam: Mum, what's the time in London?

Mum:

Sam: Is it lunch time?

Mum: Lunch time in London is at 12:30pm.

Sam: I'm hungry, mum. I want to have dinner!