句型转换。

1. I was 18 years old when I started writing the first book. (对划线部分提问)

    ______  are you when you started writing the first book?

2. He won the prize in the Nobel to become famous. (对划线部分提问)

    ______ he ______ to become famous?

3. The little girl is very short. She can't reach the apples on the tree. (改写同义句)

    The little girl is ______ short ______the apples on the tree.

4. It took people nine years to finish building the bridge. (对nine years提问) 

    ______ it ______ people to finish building the bridge? (同义句)          

   People ______  nine years ______ building the bridge.

5. Kate learnt to make her bed when she was four years old. (改写同义句)

    Kate ______ her bed at the ______ of four.