请阅读下面的短文。根据短文内容从下面五个选项中选出适当的句子还原到短文中，使短文意思通顺、结构完整。

On weekdays American students usually get up at seven .Then they have breakfast .1._______. After breakfast they go to school on foot or by school bus.  Some students ride bikes .2._____ . Then they put their schoolbags in the desks and take only one book ,a tablet and a pencil to every class . In high school students have classses for six hours .

3.___ . They usually have meat, vegetables, fruit ,bread and a drink . In the afternoon they have classses until three o’clock. Then they go home .

Students usually play or watch TV before(之前) supper . 4.________. After supper they do their homework . Sometimes they talk with their parets .5._____ , and have a big dinner at one in the afternoon .

"Tammy! Come here, please! Mother needs your help in the kitchen." Her father called out to her.
Tammy was in her room, getting ready to do her homework. "Yes, Daddy!" she replied. "I'll be right there."
She hurried out of her bedroom and down the hallway. She was only nine years old. Her elder sister, Ella, had just moved away to go to a performing arts high school in another city. Her brother, Harry, was in middle school and always got home late. With Ella leaving home, Tammy was expected to do a lot more than she had ever done before, especially now, because her mother was ill.
Her father was in the kitchen. "Tammy, I know you usually do your homework right now, but with things being different, we all have to change a little bit. I'll help you and Harry with your homework later on, OK?"
Her father had an apron（围裙） on over his clothes, and he looked kind of funny. He was doing the dishes and he always splashed（溅出） water all over when he did that. After helping her father with the dishes, Tammy helped set the table.
After supper, her father helped her and Harry with their homework, and then they played a board game so that their mother could lie down for a while.
The next morning, Tammy got up early on her own because she wanted to help her mother with breakfast. She made orange juice and even put bread in the toaster and got out the butter so that her mother could sleep for a few more minutes.
When her mother got up half an hour later, she was very surprised and moved to see the breakfast on the dining table. She gave Tammy a big hug.
"Thank you, Tammy. You really are mother's little helper now, aren't you?"
【小题1】Why did Tammy's sister move out of their home?