Before the commercial fertilizerd became popular, farmers used marl, ( )for fertilizer.
1)a kind of clay mixture
2)it was a kind of clay mixture
3)a kind of clay mixture, which
4)was a kind of clay mixture

( )superstitious beliefs about the mandrake plant.
1)people have had long
2)people have long had
3)have people long had
4)long have had people
여기서 1,2번의 차이가 있는건가요..?형용사는 아무데나들어가도 된다고생각했는데ㅠ

답이랑 풀이좀 부탁드립니다..