九岁上小学时，脖子上挂把钥匙，下午放了学写完作业帮妈妈煮稀饭，妈妈下班炒个菜就能吃晚饭。
B-Time I-Time I-Time I-Time I-Time I-Time O B-Location I-Location I-Location O O B-Thing I-Thing O B-Time I-Time O O O O O O O O B-Person I-Person O B-Thing I-Thing O B-Person I-Person O O O O B-Thing O O O B-Thing I-Thing O