根据所给情景选择正确的答案。

1. 当你向妈妈介绍张老师时，你说：[ ]

A. Miss Zhang, this is my mom.

B. Hello! I'm Miss Zhang.

C. Mom, this is Miss Zhang.

2. Mike今天过生日，你应该对他说：[ ]

A. Happy birthday!

B. Happy Halloween!

C. Happy Teachers' Day!

3. 当你想知道Sarah的年龄时，你问：[ ]

A. How old are you?

B. How are you?

C. What's your name?

4. 当Sarah告诉你她今天6岁时，她说：[ ]

A. I'm six.

B. I six.

C. I'm three.