안녕하세요!^^

17. some move in synchronized hordes, ②as others move in starkly geometric forms. ③in addition to the varieties of shapes of schools of fish, there are ④countless varieties of schooling behaviors.

왜 2번이 틀린거죠??ㅠ

18. at the end of each university term students ①are asked what they are arranging to do during the vacation. their answers reveal ②one of the saddest features of education: the split between parents and children. many of them invent excuses for being at home ③as many as possible. sometimes this is because there is not ④quiet room to work in, or because they need to earn money by taking a job, but all too often it is because they find their parents boring and unreasonable. 저는 1번이 틀린거 같았는데.. each 있어서요ㅜ 근데 왜 3번이 답이에요? as much as possible 만 되고 many는 쓰면 안되나요??
답변부탁드립니다~~^^