yes, both sentences are right.and "effort" is a noun belonging to U and C. My father puts a lot of effort into his work.此句中，effort 是不可数名词，意思是the physical and mental energy that you need to do sth 气力，努力if you want to succeed, you must make efforts.此句中，effort 是可数名词, 意思是attempts 努力的尝试 且 make efforts/ an effort to do sth 是固定词组

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