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.