Some students have Sunday off(volunteer)and(help)others.用所给词的适当形式填空.

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Some students have Sunday off____(volunteer)and____(help)others.用所给词的适当形式填空.
Some students have Sunday off____(volunteer)and____(help)others.
用所给词的适当形式填空.

Some students have Sunday off____(volunteer)and____(help)others.用所给词的适当形式填空.
volunteering
helping

volunteering helping