1．________ (climb) mountains is really fun.
解析：句意：爬山真是有趣。动名词在句中作主语。
答案：Climbing
2．________ (control) her anger, Maria turned around and walked away from him.
解析：句意：为了克制愤怒，玛丽亚转身离开了他。根据句意及句子结构可知，此处应用动词不定式作目的状语。
答案：To control
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