What does ALMOST mean? How to distinguish?

[Gabi]

English Idioms and Expressions, Intermediate level

ESL/EFL Test #9 "Go ahead", question 9

If petrol prices go up any more, I shall have to use a bicycle.

(a) ascend
(b) raise
(c) increase
(d) develop

English Idioms and Expressions, Intermediate level

ESL/EFL Test #9 "Go ahead", answer 9

If petrol prices increase any more, I shall have to use a bicycle.

Correct answer: (c) increase
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'Ascend', 'raise' and 'increase' have almost the same meaning'. What is this ALMOST? How to distinguish?

Thank you

Gabi

[Pamela]

Hi Gabi,
'Increase' is a word that pretty much collocates with a 'price'. You cannot use 'raise' in the sentence as it requires another verb rise instead. Develop is not appropriate either...