几道初中英语语法题6.I have some _________ in working out the problem.

几道初中英语语法题
6.I have some _________ in working out the problem.
A.difficulty B.difficulties C.troubles D.difficult
7.There is a wire pole along the road _________ meter.
A.about fifty B.every fiftieth C.each fifty D.every 50
8Southerners _________ rice.
A.lives on B.feeds on C.lives on D.feed on
1 0.They picked leaves from the trees and _________.
A.fed them to some little white worm B.fed some little white worm on them
C.fed some little white worm with them D.A and C
ABCD.我都错了唉.请大家各个解释下行不,
有机会追加分.记得.
C/C/D/C
第一题我看错啦，trouble 不可数对吧。
如果选C 为什么metre 不用加s
第三题 主语不是复数吗，选C 不是第三人称单数才这样吗
第四题 觉得那些介词都很奇怪 带入的话。
再补充一题吧
There is not enough light and _________ in this picture.
A.dark B.darkness C.blackness D.shade