Difference between cost and expenses

[megha]

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 not expenses?

[Alan]

The verb in the sentence is singular is and so you wouldn't use the plural word expenses.
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