________ a volunteer in the mountain village _______ me happy 填什么?为什么?
问题描述：
________ a volunteer in the mountain village _______ me happy 填什么?为什么?
答
Being a volunteer in the mountain village makes me happy
动词不能做主语,只能有动名词或者不定式作主语,后面一格因为是make+宾语+形容词.