Regulations require__________needs special diets         the cooking manager in advance.
#73952
A
who; informs
B
whom; informed
C
whomever; inform
D
whoever; inform
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It was funny that when _______ Mary began to weep sadly. 
#68175
A
praising
B
praised
C
to praise
D
having praised
David can speak idiomatic American English and yet, _____ English, he doesn't know it at all. 
#73915
A
how to teach
B
when it comes to teaching
C
when he teaches
D
however he teaches
Though the key was pressed, nothing ______ on the screen.
#41230
A
appeared
B
was appeared
C
appears
D
is appeared