1. 根据情景, 选句子完成对话。

(下午, Sarah带同学Mike回家, 把他介绍给妈妈, 然后两人相约一起画画。)

Sarah：Mum, this is Mike.

Sarah's mum：

Mike：Good afternoon.

Sarah's mum：

Sarah：

Mike：

A. OK!

B. Mike, this is my mum.

C. Good afternoon, Mike.

D. Nice to meet you.

E. Let's paint.

F. Nice to meet you, too.