________ anyone come to my office, please tell them I'm not available before four o’clock.
#66853
A
Might
B
Could
C
Would
D
Should
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I have two grammars, ______are of great use. 
#73806
A
all of which
B
either of which
C
both of that
D
both of which
__________for the bus, I heard a noise,
#69550
A
While waiting
B
While I waiting
C
I was waiting
D
Waited