Idiom 'grin and bear it'

[Marianne M.]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #69 "Bearing Information", question 6

There is really nothing much you can do to stop it and I'm afraid you'll just have to ......... and bear it.

(a) scorn
(b) grin
(c) laugh
(d) smile

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #69 "Bearing Information", answer 6

There is really nothing much you can do to stop it and I'm afraid you'll just have to grin and bear it.

Correct answer: (b) grin

Your answer was: incorrect
There is really nothing much you can do to stop it and I'm afraid you'll just have to scorn and bear it.
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Dear teachers,
Why it`s "scorn" impossible? I though, " scorn" could be belong to "I`m afraid" in this phrase?
Marianne

[Mister Micawber]

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The idiom is 'grin and bear it', which means endure it equitably. 'Scorn' is irrelevant.
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Native English teacher at Mister Micawber's