题目内容：

Sarah  and Janet have been friends since they   1. (start) school. They do everything together: study, read, watch TV, surf the Internet, play sports and listen to music. Anyone   2.  has a problem can ask the other for help. When Sarah was in the   3.  (three) grade, some of the other students made fun of her   4.  she was shy. Janet told the other students to stop   5.  (make) fun of Sarah, and she helped Sarah overcome her shyness. In the fifth grade, Janet had 6.  (difficult) in her maths class. She studied hard,   7.  she just couldn’t understand the homework. Sarah helped Janet   8.  her homework and   9.  (patient) explained every exercise to Janet. After six months, Janet did much better and even got   10. A in the maths exam.