'disappeared completely' vs 'disappeared quickly'

[Milly]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #8 "From Shakespeare originally", question 8

They looked everywhere for the lost passport but it seems to have vanished into thin air.

(a) disappeared slowly
(b) disappeared gradually
(c) disappeared completely
(d) disappeared quickly

English Idioms and Expressions, Advanced Level

ESL/EFL Test #8 "From Shakespeare originally", answer 8

They looked everywhere for the lost passport but it seems to have disappeared completely.

Correct answer: (c) disappeared completely
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why not disappeared quickly?

Milly

[Alan]

Hi,

'Vanish into thin air' is an expression describing a situation when you can't you can't find something at all although you know it was there a short time ago. This has nothing to do with how quickly something has apparently disappeared.

Alan
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English as a Second Language
You can read my ESL story Present Simple