选用方框中的句子填空，把对话补充完整。

A. It' s time to go home. B. I like playing basketball. C. What time is it? D. Shall we play basketball? E. I want to help her cook dinner.

It's 4:30.

Xiaoming: Hi, Jack. School is over. Let's go to the playground.

Jack: OK. What shall we do?

Xiaoming: That's great. Let's go.

An hour later（一小时后）.

Xiaoming:

Jack: It's 5:30.

Xiaoming: Oh, it's late. My mum is cooking dinner for us at this time.

Jack: I think my mum is cooking too.

Xiaoming: Let's go back home. Bye!