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.