Expressions with prepositions

[Thai Binh]

English Error, Elementary Level

ESL/EFL Test #7 "English Prepositions", question 7

I'll go across with you on the first point but I'm afraid I can't possibly agree with you on points two and three.

(a) across
(b) on
(c) with

English Error, Elementary Level

ESL/EFL Test #7 "English Prepositions", answer 7

I'll go along with you on the first point but I'm afraid I can't possibly agree with you on points two and three.

Correct entry: along
The error was: (a) across
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What is the correct sentence? Help me to explain clearly about the way they are using preposition in this sentence?

Thai Binh

[Torsten]

I'll go along with you means I agree with you
I agree with you means I share your opinion, I think you are right
on points two and three means regarding points two and three
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