3a 部分答案
Mario volunteers at an animal hospital every Saturday morning.
Mary works at an after-school reading program once a week to help kids learn to read.
3b 部分答案
1. Mario volunteers at an animal hospital because he loves animals and wants to be an animal doctor. He believes his volunteer work can help him get his future dream job and Mary volunteers at an after-school reading program because she loves books and enjoys helping kids learn to read.
2. Mario says volunteering is hard work,but he can get a strong feeling of satisfaction from it. And Mary says volunteering at an after-school reading program is a dream come true for her. She can do what she loves to do and help others at the same time.
（答案仅供参考）
3c 部分答案
1. to be 2. to learn,to care 3. to try out,to help 4. to do
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