21.  They found some imformation for our army , these helped to push back the enemy.

22.  The girl's mother had a bad ill for a long time, then the girl looked after her mother and loved her mother, what the girl had done helped her mother keep out her ill , and then her mother was better.

23.  The windows haven't been cleaned for a year, now it's very dirty.

24.  This week, it's our turn to sweep the school , On Monday, we went to school at 6:45, the sky was too black, and the street had nobody, we started working , the ground had many leaves , It took times for us to carry he eaves .

25.  Mr Zhu gave several question for us, the one of them was if Zhou Pu Yuan loved Lu Si Ping , then some people said Zhou Pu Yuan loved Lu Siping, the others said Zhou u yuan didn't love Lu iping.

26.  Our school have founded for thirty years.

27.  Although he was very poor, he sent money to her for a long time.

28.  When we got to the hospital, we saw Miss Yang was looking after her daughter, we learned that Miss Yang hadn't been in bed for a day .

29.  When Miss Yang saw these, She was moved to tears, and said: "hank you for your help".

30.  The teachers in our school are all excellent, they have good learning and rich experience, they are strick with us.We all show repect for them.