1. in 1972 president nixon placed ________ on international currency markets, thereby ending the centures-old gold standard
여기서 명사구인 the us dollar은 되는데 부정사구인 to the dollar us는 안되는건가요?
2. at the age of forty-three, john f. kennedy became______of the united states.
여기서 the president는 되는데 부정사구인 to the president 왜 안되는건가요 ? ㅠㅠ
그리고
3. spirits seem ____ as an explanation for the diversity of liveing things to animists
여기서 왜 valid는 되고 a valid는 안되나요 차이점이 뭔가요?ㅠㅠ 부탁드립니다.
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