句型转换。(每空1分，共6分)
She was sitting with her sister by the river. (改为一般疑问句)
___________ she sitting with her sister by the river?
Hong Kong is a big city. It has seven million people. (合并为一句)
Hong Kong is a big city ___________ seven million people.
Indian is smaller than China. (用big 改为同义句)
China is ___________  ___________ India.
Mr Yang often rides to work. (改为同义句)
Mr Yang often goes to work ___________  ___________ .