_______cloning human embryos is not legal in many countries, some scientists are already pushing ahead with research in order to produce a cloned human baby.
#31691
A
While
B
When
C
Since
D
if only
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Your uncle seems to be a good driver: _______, I wouldn’t dare to travel in his car.
#80194
A
even so
B
even though
C
therefore
D
so
You can borrow my car ________ you promise not to drive too fast.(2012·江西，31)
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A
unless
B
even if
C
in case
D
as long as
Junk messaging has been a headache for years, ＿＿the action taken by the authori-ties has not yet produced the results expected
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A
as
B
but
C
so
D
before
—People often don't appreciate what they have, do they? —No, _____ they lose it.
#30099
A
if
B
after
C
when
D
until