句型转换，每空一词。

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.