句型转换。
1. Lucy usually cleans the cage every two days. (对画线部分提问)
______ ______ does Lucy usually clean the cage?
2. Jenny worked hard in order to catch up with others. (将简单句改为复合句)
Jenny worked hard ______ ______ she could catch up with others.
3. Nothing is impossible if you put your heart in it. (改为反意疑问句)
Nothing is impossible if you put your heart in it, ______ ______?
4. Mary came to China three years ago. (改为同义句)
Mary has ______ in China since three years ago.
5. Zhai zhigang became the 1st Chinese astronaut to walk in space. (改为定语从句)
Zhai zhigang became the 1st Chinese astronaut ______ ______ in space.