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.