Scientists still wonder ______ cloning will help or harm us and _____ it is leading us.
#68782
A
that; what
B
whether; where
C
if; that
D
whether; how
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So many uses have been discovered for this wood ____ the supply of white pine is becoming smaller and smaller.
#72577
A
then
B
what
C
that
D
which
Women prefer to buy food which has already been prepared ______it reaches the market．
#72737
A
after
B
for
C
before
D
until
The factory ______we'll visit next week is not far from here.
#73828
A
where
B
to which
C
which
D
in which