Scientists say it may be five or six years_______it is possible to test this medicine on human patients.
#92600
A
when
B
after
C
before
D
since
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Although Fleming discovered Penicillin, it was over a decade ______ someone else turned it into the great drug of the 20th century.
#92265
A
before
B
since
C
when
D
as
______is now no doubt ________ global warming is a security threat to us all.
#94613
A
It; that
B
There; that
C
There; whether
D
It; whether
The great use of school education is not so much to teach you things ___ to teach you the art of learning.
#94770
A
as
B
that
C
than
D
but
The picture reminded me of the golden days in the small village I was taken good care of.
#93781
A
where
B
that
C
then
D
which