What is the diference between good and okay?

[jadson]

English Language Tests, Intermediate level

ESL/EFL Test #253 "Good, Well and Okay Test (1)", question 2

I hope Dorothy gets away soon. I think a relaxing vacation will do her a world of ..........

(a) good
(b) well
(c) okay

English Language Tests, Intermediate level

ESL/EFL Test #253 "Good, Well and Okay Test (1)", answer 2

I hope Dorothy gets away soon. I think a relaxing vacation will do her a world of good.

Correct answer: (a) good
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What is the diference between good and okay?

jadson

[Mister Micawber]

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The idiomatic expression here is 'do...a world of good', which means 'be very effective/therapeutic'.
.
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Native English teacher at Mister Micawber's