Students are required to go out in couples, especially in the evenings, with friends ______ they get into trouble．
#32395
A
even if
B
if only
C
in case
D
when
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_______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
From time to time a crocodile has snatched someone _______ he or she is even aware that the crocodile is there.
#33837
A
when
B
until
C
since
D
before
He is so busy.He cannot afford enough time with his son________he wants to.
#30244
A
even if
B
as if
C
because
D
before
______all of them are strong candidates, only one will be chosen for the post.
#30864
A
Since
B
As
C
If
D
While
___ children believe they can succeed, they will never become totally independent.
#31308
A
Unless
B
Though
C
When
D
If