1.I know it's not important but I can't help_____about it.
A:to think B:thinking C:thinks D:think
can't help doing sth.:禁不住,忍不住要做…
2.I____you with the funds.Why didn't you ask me?
A:could have provided B:should have provided C:must have provided D:ought to have provided
省去条件从句或主句：表示虚拟语气的主句或从句有时可以省略,但其含义仍可以推知.
3.While I____the morning paper,a headline caught my eye.
A:have read B:was reading C:had read D:am reading
过去进行时考点：某一动作发生时另一动作正在发生,其中一个在由when或while引导的时间状语从句中用过去进行时.
4.______the strength of the opposition,we did very well to score two goals.
A:To consider B:Considered C.Considering D.Consider
选择现在分词还是过去分词,关键看主句的主语.如分词的动作是主句的主语发出,分词就选用现在分词,反之就用过去分词.
(Being ) used for a long time,the book looks old.由于用了很长时间,这本书看上去很旧.
Using the book,I find it useful.在使用的过程中,我发现这本书很有用.
5.A little learning is a dangerous thing,_____the saying goes.
A.like B.as C.with D.if
as,(just) as…so…引导的方式状语从句通常位于主句后,但在(just) as…so…结构中位于句首,这时as从句带有比喻的含义,意思是"正如…","就像",多用于正式文体.
P.S:没有给出答案,希望你仔细看了解释会有自己的答案.