请各位英语好的帮个忙,最好有相应的说明及短语辨析
She walked alone_the end of the river.
A.as far as B.until
C.for D.by
--Will＄200_?
-I'm afraid not.We need at least another 100 dollars.
A.count B.satisfy
C.fit D.do
Fishes have been disappeared because of heavy pollution.（改错,尽量将错误都找出来,并注意改错的原则,）