Mrs Simpson wanted to invite (邀请) many people to her house.……请填空

Mrs Simpson wanted to invite (邀请) many people to her house.……请填空
Mrs Simpson wanted to invite (邀请) many people to her house.She wanted to cook them a good dinner of meat and soup.She had five daughters.They were all busy.Mrs Simpson was busy ,too.She forgot to put any salt (盐) into the soup.So she asked Mary,one of her daughters,to help her.“I can' t ,Mum.I' m busy now.”said Mary.She asked the other girls ,but got the same answer.So she did it herself.
Now ,Mary thought she should help mother.She put some salt into the soup.One by one ,the other girls did the same thing.
Mrs Simpson put the soup on the table.The friends took a little soup and their eyes opened wide (张大的).She took the soup,then she knew.“Which of you put salt into the soup?”she asked.“I did it ,Mum.”all the other five said together
Mrs Simpson has five girl,and they were very busy.so( )Mrs Simpson .空里填什么?