【題目】People volunteer to express personal values, to expand their range of experiences, and(strength) social relationships.

【答案】to strengthen
【解析】句意：人們自愿表達個人價值觀，擴展經歷范圍并且增強社會關系。根據(jù)前面的to express personal values, to expand，可以判斷出三個不定式動詞并列。故填to strengthen。

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