_______ is the most useful invention?
#70076
A
Do you think which of these
B
Which of these do you think
C
Which of these you think
D
You think which of these
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Is _______ some German friends visited last week? 
#73757
A
this school
B
this the school
C
this school one
D
this school where
She is a woman of great knowledge, _______ much can be learned.
#68758
A
in whom
B
about whom
C
of whom
D
from whom
______, he always makes time for his family.
#68381
A
No matter he is busy
B
No matter how busy he is
C
However he is busy
D
However busy is he