1.John will sell ---------- his stamps to help the poor chil

1.John will sell __________ his stamps to help the poor children in the west of china.
A.hundreds B.one hundred of C.one hundred D.quite a few
2.Who jumps ____in your class?
A.longest B.the longest C.farthest D.the farthest
请说明原因
3.I have three cousins.one is in grade six ,____is in grade seven and________is in grade eight.
A.other ,the other B.another,the third C.the other ,the third D.the other another
我选C another里包含名词吗？
第一题答案的确是B不过为什么要加of？