Non-PRO English Art/Literary Linguistics as for / as to

Humans are ..........(1)visual animals.Eighty percent,maybe even ninety percent,of the information that we receive about the world comes to us as visual input.Bats,......,(2)depend mainly on sound,"seeing"the world by echolocation of reflected..........(3)signals that they themselves generate.And.............(4)the other senses,any dog owner.........(5)you that an object without smell counts as little or nothing in the canine world.

1-a)primarily b)vaguely c)slightly d)entirely e)possibly

2-a)perhaps b)on porpose c)by comparision d)in jeopardy e)by virtue of

3-a)visual b)electric c)fragile d)sound e)reverse

4-a)when it comes b)as for c)as to d)as such e)by now

5-a)would have told b)would be telling c)has told d)wil tell e)won't tell


Hi everybody, the above question has raised a higly controversial point among my colleagues. Although we don't fall apart on the same answers to most of the questions above the fourth question in fact posed a brain racking challenge.To sum it up, I think the for the fourth question, the answer must be "as for" but my colleagues insist that the answer should be "as to", what is the subtle difference between these to phrases.Which one? "as to" or "as for"

Your explicit answers are much appreciated! Thank you very much!