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volunteer
mastery UK /ˌvɒl(ə)nˈtɪə/ US /ˌvɑlənˈtɪɹ/nounverb
card 1 of 10 · preposition
My sister volunteered _____ the community cleanup project last weekend.
card 1 of 10 · preposition
My sister volunteered _____ the community cleanup project last weekend.