为加强对未成年人健康成长的保护，我国《未成年人保护法》规定：禁止用工单位非法招用               的未成年人。  [ ]

A、已满18 周岁    

B、已满16 周岁  

C、未满16 周岁  

D、未满14 周岁

按要求改写句子。

1. Please write down your name here. (改为否定句) 

    Please ____ write down your name here.

2. I swept the floor just now. (改为一般疑问句)

    ____  you ____  the floor just now?

3. She needs to wear her school uniform. (改为否定句)

    She ____  ____ to wear her school uniform.

4. I often help my mum do the laundry on Sundays. (改为同义句)

    I often help my mum ____ ____ on Sundays.

5. The boy is cleaning the table. (对画线部分提问)

    ____ ____ the boy ____ ?