A. me    
B. my

1. 你向别人介绍这是你的朋友李明时，你应说：

A. He's my friend, Li Ming.
B. This is my friend, Li Ming.
C. That's my friend, Li Ming.

2. 见到李明你很高兴，你应说：

A. Nice to see you.
B. How are you?
C. How do you do?

3. 你想帮助别人时，你应说：

A. Let you help me.
B. Let me help your.
C. Let me help you.