21.  Would you please to help me to work out it?

22.  When I was a Junior middle school student, my poorents work very far from me , so I had to live at school, I could see them only one time each month , I felt very lonely, it's too hard for me .

23.  My father had to clean alone because my mother had to go to work that day.

24.  We had only thirteen days to do it so that I had almost finished the homework before February 1.Except maths and physics, I must wasted a long time to work out every question.

25.  I almost did the same work in several days.

26.  Almost people who live in Beijing go to work by bus or by bike.

27.  We work five days in a week, and every day we work eight hours.

28.  Tonight I work deep into the night gain.

29.  Now, we are talking about today's home work of methematics .

30.  Now the school has thirty-six classes and there are one thousand and eight hundred stydents and two hundred teachers study or work in it .

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