生物体内脂肪的生理功能包括（　）
①生物膜的重要成分
②储能物质
③缓冲和减压、保护内脏器官    
④具有生物学活性，对生命活动具有调节作用
⑤促进人和动物肠道对钙和磷的吸收
⑥绝热体，保温作用

用所给词的适当形式填空

（1）—When does Mary usually go to bed？

         —She ____ (go) to bed at nine thirty.

（2）Tony's sister always ____ (do) her homework first when she gets home．

（3）Ice-cream usually ____ (taste)good.

（4）My father often ____ (take) a walk in the evening.

（5）Tony usually gets up late. He doesn’t have time ____ (eat) breakfast.