What does 'high hopes' mean? Is it an idiom?

[Pupil]

Test No. incompl/inter-56 "High and Low", question 2

I have high ......... that we will succeed with our project in view of all the interest we have received.

(a) feelings
(b) sensations
(c) hopes
(d) views

Test No. incompl/inter-56 "High and Low", answer 2

I have high hopes that we will succeed with our project in view of all the interest we have received.

Correct answer: (c) hopes

Your answer was: incorrect
I have high feelings that we will succeed with our project in view of all the interest we have received.
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Why word feelings doesn't fit in here?
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the more we learn
the less we know

[Alan]

Here hopes indicates the future as in the sentence 'we will succeed'.
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English as a Second Language
You can read my ESL story Womens' Day