1. They can hardly do the things they like. (改为反意疑问句)
    They can hardly do the things they like ______ ______?
2. I have been collecting stamps for many years. (对画线部分提问)
    ______ ______ you been collecting stamps?
3. We saw him go into a shop yesterday afternoon. (改为被动语态)
    He was ______ ______ go into a shop yesterday afternoon. (同义句改写)
4. If you don't study hard, you will fall behind others. (同义句改写) 
    ______ you study hard, you ______ catch up with others.
5. She became strong day by day as he took exercise. (同义句改写)
    The ______ exercise she took, the ______ she became.