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Peter is standing ____ the classroom. (A) out (B) out of (C) outside (D) outside of

Which choice is acceptable?
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I find both C and D acceptable.

CJ
Comments  
Girl: I woke up at four this morning.

Boy: Why so early?

Girl: There were some noises ___ the room.

(A) out (B) out of (C) outside (D) outside of

Which choice is acceptable?