Scientists say it will be five or six years _____ it is possible to test this medicine on human patients.
#68451
A
before
B
that
C
since
D
when
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—Nowadays the doctors are trying their best to reduce the people’s fear they would be affected by the present disease called “Bird Flu （禽流感）”.
#74163
A
whether
B
which
C
that
D
when
Parents are taught to understand ________ important education is to their children’s future.
#69087
A
that
B
how
C
such
D
so
In some countries, _____ are called “public schools” are not owned by the public.
#74154
A
which
B
that
C
as
D
what
I’ll go to see the film with you if it ________ rain tomorrow.
#41141
A
isn’t
B
doesn’t
C
won’t
D
isn’t going to