I can't ___________ how it happened.
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You are wasting your time that could ________ for something else.
A. use
B. be used
We'll tell him to keep his mouth ________ as to why we want it.
A. shut
B. shutting
I'm in a puzzle ________ what to do next.
A. as
B. as to
Nobody cares ______________.
A. you think
B. what do you think
C. what you think