1. This is a white box.(改为一般疑问句) 

_________ _________ a white box?

2. Are you from China?(作肯定回答) 

_________, I _________.

3. His sister is from Kunming.(对画线部分提问)

__________ is his sister ___________?

4. This is a bus.(改为复数句)     

 _________ are __________.

5. She has long legs.(改为同义句)      

_________ legs __________ long.