Exchange programs are invaluable experiences because being exposed to a foreign culture fosters increased understanding.여기서, increasing이 맞지 않나요?
해당 자리는 명사 understanding을 꾸미는 자리로 형용사 역할을 하는 과거분사가 와야 맞아요...(being exposed to foreign culture) (fosters) (increased understanding)
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