volunteer相关动词用法 — 英语词汇题
题目
首字母补全（每空一词）：1. She wants to be a v____, so she often helps old people in the park. 2. Last Sunday, we v____ at the animal hospital and fed the dogs. 3. Thank you for v____ to clean the classroom with us. 4. More and more students are joining the volunteering c____ at our school.