New words：

volunteer [.vɔlən'tiə]
n.志愿者；志愿兵；义务工作者；自告奋勇者
v.自愿做；义务做

Sample Sentences：

The soldier volunteered for guard duty.
They volunteered to repair the house for the old lady.

Can I have a volunteer to wash the dishes?
Volunteers were ready and waiting to pack the food in boxes.

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