1.（ ）a teacher,John thinks that his main duty is to heip the

1.（ ）a teacher,John thinks that his main duty is to heip the students to become better learners.
A.As B.By C.About D.For
我想问问,这四个选项的区别.
2.—Maya is a loving grandmother.
--Yeah,she__all her feer time on her grandchildren.
A.pays B.takes C.costs D.spends
为什麽不选A不是take用于时间上吗?
3.I could not see __,because there was not ___
A.enough clearly,light enough B.clear enough ,enough light C.enough clearly,enough light D.claerly enough ,light enough
为什麽不选D,此时light做表语,是adj.enough应该后置啊?
4.The teacher ___be in office ,for I saw her here just a minute ago.
A.can not B.needn't C.mustn't D.won't
这道题需要把四个选项都分析一下,