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.

1. Lucy usually cleans the cage every two days.  (对画线部分提问)
    _____ _____ _____ Lucy usually clean the cage?
2. Jack's grandfather doesn't know how he should use a computer. (改为简单句)
    Jack's grandfather doesn't know how _____ _____ a computer.

1. We had to have an English test this morning. (变为一般疑问句)
    ______ you ______ to have an English test this morning?
2. There is something interesting in today's newspaper. (变为否定句)
    There ______  interesting in today's newspaper.
3. The boy in the river is Mr Green's son. (对画线部分提问)
    ______ is Mr Green's son?
4. The population of Tianjin is about 12 million. (对画线部分提问)
    ______ the population of Tianjin?
5. Is Uncle Wang a teacher? (用a worker改为选择疑问句)
    _______ Uncle Wang a teacher _______ a worker?
6. I used to read newspapers after supper. (改为一般疑问句)
    _______  you _______ read newspapers after supper?
7. Lucy usually cleans the cage every two days. (对画线部分提问)
    _______ Lucy usually clean the cage?
8. Let's go to the cinema, _______? (补充反意疑问句)
9. —Do you have a bike? (作肯定回答) 
    —_______, I _______.
10. —Have you been to Beijing? (作否定回答)
      — _______, I _______.