按要求改写句子。
1. When he was eight, he began to learn the accordion. （改为同义句）
______________ eight, he began to learn the accordion.
2. The girl looks after the baby well. （改为同义句）
The girl ______________ the baby.
3. It takes about 15 minutes to walk home.（对画线部分提问）
______________ it to walk home?
4. I went home after I finished my homework.（改为同义句）
I _____________ home until Ifinished my homework.
5. I think Liu Ying is not as tall as her sister.（同上）
I think her sister is _____________ Liu Ying.
