________ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
#30263
A
Even if
B
As far as
C
If only
D
So long as
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Was it because of the heavy snowstorm in Europe the flight had to be put off?
#32608
A
which
B
so
C
why
D
that
She had to drop out of school _____ her family couldn’t afford the cost of her education.
#31519
A
although
B
unless
C
because
D
so
We were going out for a Christmas meal together ______ the accident happened.
#34000
A
unless
B
until
C
while
D
when