根据短文内容在下面的每个句子的空格中填上一个词，使其意思与原文相符。
Mr and Mrs Black live in London. Mr. Black drives a car in a factory and Mrs. Black teaches in a school.
They have a daughter and two sons. The daughter is five and the sons are only one year old. They were born
on the same day and they look the same. Mrs. Black always dress them in the same shirts and trousers, so it's
hard to tell who they are. Mr. Black can hardly differentiate (区分) them. Mr. and Mrs. Black have no time to
look after their children. They have to hire a servant (雇佣一个佣人), Alice. The girl is kind and they all like
her.
Today Mrs. Black has to go to the hospital. She says to Alice,"Bath Tom and Tim and dress them the clean
clothes."
"OK, Mrs. King," says Alice."But I can't differentiate them."
"Don't worry," says Mrs. Black."Ann can tell you about it."
Soon Alice finishes bathing the two children. She puts them on the bed and wants to dress them. She asks,
"Which is Tom, Ann?
"I'm sorry," answers Ann."I can't differentiate them. I only know Mummy always puts Tom on the left and
Tim on the right."
1. Mr Black is a __________ and his wife is a __________.
2. There are _________ people in Mr. Black's family.
3. Mr. Black's two sons are ________ and Mrs. Black always dresses them the same ________.
4. The Blacks are _______ busy _______ they can't look _______ their children. So the hire Alice.
5. From the story we know that only _______ ________ can differentiate the two babies.