GATE 2015 CS (CS2) – Question 1
Fill both blanks: We ____ our friend’s birthday and we ____ how to make it up to him.
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Show answer and explanation
Correct answer: (C) completely forgot — just don’t know
Explanation
The natural adverb placement is “completely forgot”. To express simply not knowing, the phrase is “just don’t know”; “don’t just know” changes the scope of just. Thus C supplies both idiomatic expressions.