Cost of travel?

[kai]

Test No. incompl/elem-2 "Money accepted", question 1

I like to visit other countries but I find the ......... of travel is too high.

(a) money
(b) cost
(c) expenses
(d) currency

Test No. incompl/elem-2 "Money accepted", answer 1

I like to visit other countries but I find the cost of travel is too high.

Correct answer: (b) cost

Your answer was: incorrect
I like to visit other countries but I find the expenses of travel is too high.
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Why cannot use " expense " ?

[Torsten]

Take a look at these examples:

travel expenses
travel costs
cost of travel
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Guest]

[Alan]

This is a word meaning particular sums of money for a certain journey. If you go for an interview, sometimes your future employer will pay you what you spent on travel and this would be called travel expenses. The word cost is a general word for what you have to pay.
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English as a Second Language
You can read my ESL story Phrasal Verbs/bring

[Guest]

[Torsten]

Yes, cost is the price you pay in order to obtain something.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[evren]

I find the expenses of travel is too high.
I think this sentence is wrong because there's 2 verbs:
find and be
Am I wrong if not why?