문장해석과 정답설명부탁드립니다.

1. ____________ these daunting challenges, the realists say, are all those voters who are not prejudiced but genuinely feel that obama is not the best choice for president.

1) add 2) adding to 3) addition of 4) added to2. if, decades after their burial, someboby will always be wanting to bring celebrity to the surface, the solution may not be to bury them in the first place.

2번 문제에서는 decades가 틀렸다고 하는데 왜 그런지 이유를 좀 설명해 주세요.