Is this research centre _____ is full of modern equipment you always mention.
#78318
A
where
B
that
C
the one that
D
the one where
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The children, _____ had played the whole day long, were worn out.
#76416
A
all of what
B
all of them
C
all of whom
D
all of which
This is the desk, ______desk is broken.
#75470
A
whose
B
of which
C
which
D
that
Please never do such things _______ other people. 
#77068
A
that will do harm to
B
as they will do harm to
C
as will do harm to
D
which are harmful to