One day, an incident deeply touched us.A girl suggested that she teach us how to fold paper.She taught us 23.________ great patience, explaining each step slowly and clearly.Though we could easily do that, we still pretended to know nothing about it.We followed her, step by step, doing everything she told us.Finally, 24.________ we finished our work successfully, she gave each of us 25.________ big hug.We could see the pride and happiness on her face.Her father was so thankful to us that he held our hands tightly, tears in his eyes.And it was not until then 26.________ we knew the girl would receive an operation the next day.

　　Many stories happened at the center.It was really a 27.________ (value) experience to us all, enriching our life in a positive way.The children's happy faces and 28.________ strong minds will stay with us forever.The days we spent at the Center inspired us boys 29.________ (reflect) on many things.We began to reflect on how to deal with the difficulties in life, because our “troubles” seem not worth mentioning at all compared with 30.________ these innocent kids are going through.

　　解题导语：在儿童医疗保健中心的经历让我们受益匪浅。

　　21．此处作非谓语动词，根据语境用分词短语作方式状语，表主动。

　　suffering

　　22．根据“it was...”可知过去的过去用过去完成时。

　　had expected

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