句型转换。
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.
