将下列句子中的汉语部分译成英语，注意所用词的形式。

1. What's this _____? ( 用英语)

2. — _____ is he? ( 几岁；多少岁 )

    — He is fourteen. 

3. — What does your sister look like?

    — She has _____. (一张圆圆的脸)

4. — What does Han Mei look like?

    — She has a round face and _____. (长发)

5. My English teacher_____ China. (来自)

What you should do is just ________ the milk until it boils and then turn off the gas. [ ]

A. watch 

B. notice 

C. sense  

D. attend