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。
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