Section 3
3c
范文：
Yang Lei,a Peking University graduate,went to a poor mountain villige as a volunteer.Her parents agreed with her decision.Yang Lei lived and studied with the students together.They got on well with each other.Though it was （ hard work）,Yang felt happy.（After graduation ）she went there again and worked at a high school as a math teacher.
旁批：1.辛苦的工作,注意work 是不可数名词.
2.毕业后,graduation 是 graduate 的名词.