八年级英语的几道填空题谁能用语法解释该怎么做?

八年级英语的几道填空题谁能用语法解释该怎么做?
1.China is rich _______ oil and coal.
A.at
B.in
C.of
D.for
2.I'm going to feel the wind ______ my face.
A.in
B.at
C.on
D.to
3.The sheep feed most ______ grass.
A.on
B.to
C.with
D.for
4.Mary is as ______ as Grace.
A.well
B.good
C.better
D.best