If you feel tired and sick of fat food, that is ______ you have to go to the hospital for medical examination.
#73982
A
why
B
whether
C
when
D
what
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  This is the plane _______ he went to Shanghai ______ business.
#71914
A
where, for a
B
by which, on the
C
in which, on
D
where, on
—What’s that building?—       the medical equipment is stored.
#72607
A
There’s in which
B
That’s where
C
The building that
D
That’s the building which
 The old tower must be saved, _______ the cost. 
#70114
A
however
B
whatever
C
whichever
D
wherever